Southern California imaging guide · MRI, CT, ultrasound, mammography and reports
Choose the Correct Diagnostic Medical Group Center Before Your Imaging Appointment
Diagnostic Medical Group of Southern California is an outpatient imaging organization that has served the greater San Gabriel Valley since 1984.
Its four centers do not offer identical exams. This guide shows which location performs each test, what to confirm before scheduling, how to prepare, how reports reach your doctor and what to do when an order or result is missing.
MRI
64-SLICE
CT
ULTRA
SOUND
DIGITAL
MAMMO
RADIOLOGY REPORT
Diagnostic Medical Group is an outpatient imaging center, not an emergency department. Call 911 or go to an emergency department for severe chest pain, stroke warning signs, major trauma, uncontrolled bleeding, loss of consciousness or another potentially life-threatening condition.
Confirm the organization before sharing personal information. This article covers Diagnostic Medical Group of Southern California at DMG.net. Other businesses use similar names and may have unrelated locations, portals and phone numbers.
Imaging centers
Four Southern California locations
CT locations
Monterey Park and City of Industry
MRI locations
San Gabriel, Monterey Park and City of Industry
Information checked
August 1, 2026
Start with the ordered exam
Which Diagnostic Medical Group center should you use?
MRI OR NUCLEAR MEDICINE
Check San Gabriel first
San Gabriel lists MRI and is the only DMG location whose public service list includes nuclear medicine and EKG.
Also listed: digital X-ray, ultrasound, digital mammography and DEXA bone-density scanning.
MRI OR 64-SLICE CT
Use Monterey Park or City of Industry
Both locations list 1.5 Tesla MRI and 64-slice CT, together with X-ray, ultrasound, digital mammography and DEXA.
Choose between them based on appointment availability, insurance approval and travel distance.
X-RAY OR ULTRASOUND
Arcadia offers a smaller service menu
Arcadia’s published list includes digital X-ray and ultrasound. X-ray is specifically listed for Monday, Tuesday and Thursday only.
Call before traveling because the public directory does not list CT or MRI at Arcadia.
Best routing sequence: Read the exact exam name on the order, select a center that publishes that service, confirm the order and authorization have arrived, then ask for preparation and arrival instructions.
Official service-by-location guide
Diagnostic Medical Group locations, phone numbers and exams
Services published for each Diagnostic Medical Group center
| Location |
Phone and fax |
Services listed |
Important local detail |
San Gabriel
1129 S. San Gabriel Boulevard
San Gabriel, CA 91776
|
Phone: 626-287-6746
Fax: 626-287-8357
|
MRI, nuclear medicine, digital X-ray, ultrasound, digital mammography, DEXA bone density and EKG.
|
This is the only center whose current DMG service list includes nuclear medicine and EKG.
|
Monterey Park
208 N. Garfield Avenue
Monterey Park, CA 91754
|
Phone: 626-288-8029
Fax: 626-288-7056
|
1.5 Tesla MRI, 64-slice CT, X-ray, ultrasound, digital mammography and DEXA bone density.
|
A practical choice when the order requires both MRI or CT capability and another imaging service.
|
City of Industry
18575 E. Gale Avenue, Suite 105
City of Industry, CA 91748
|
Phone: 626-363-1733
Fax: 626-363-1735
|
1.5 Tesla MRI, 64-slice CT, digital X-ray, ultrasound, digital mammography and DEXA bone density.
|
Save the suite number. The official address places DMG in Suite 105.
|
Arcadia
125 Wheeler Avenue, Suite A
Arcadia, CA 91006
|
Phone: 626-566-3900
Fax: 626-566-3760
|
Digital X-ray and ultrasound.
|
X-ray is listed for Monday, Tuesday and Thursday only. Verify the day before traveling.
|
Do not assume every center performs every exam. CT is published only for Monterey Park and City of Industry. Nuclear medicine and EKG are published only for San Gabriel. Arcadia currently lists only X-ray and ultrasound.
Official hours are not clearly published in DMG’s location directory. Call the selected center to confirm opening time, appointment time, check-in deadline and whether the department follows a separate schedule.
Scheduling workflow
How to schedule a Diagnostic Medical Group exam
Read the exact exam name
Determine whether the order says MRI, CT, X-ray, ultrasound, mammogram, DEXA, nuclear medicine or EKG. Also look for the body part and whether contrast is requested.
Select a center that offers the test
Compare the official service list above. A closer center may not have the required scanner.
Call the location directly
Give the scheduler your full name, date of birth, referring provider, exact exam and insurance information.
Confirm the order was received
Ask staff to verify that the signed order includes the correct exam, body part, diagnosis and contrast instructions.
Confirm authorization status
Some insurers require approval before MRI, CT, nuclear medicine or other advanced imaging.
Ask for exam-specific preparation
Fasting, water intake, medication instructions and contrast preparation vary by exam.
Ask what to bring
Confirm whether the center needs identification, insurance cards, the paper order, laboratory results or previous images.
Save the full appointment details
Record the facility, address, suite, date, check-in time, exam time, preparation and direct phone number.
Scheduling call script
“I have an order for [exact exam and body part] from [referring provider]. Does your location perform this exam? Have you received the signed order and insurance authorization? Will contrast be used, how should I prepare, what should I bring and what time should I check in?”
Avoid an unusable order
What the imaging order should clearly identify
Patient’s legal name and date of birth
Exact imaging examination
Correct body part and side
With contrast, without contrast or both
Clinical reason or diagnosis information
Referring provider’s name and signature
Provider office phone and fax
Insurance authorization when required
The order says only “MRI”
Ask the referring office to clarify the body part, side and contrast requirement before the appointment.
The center has no order
Call the referring office and confirm the exact fax number used. Then call DMG again to verify receipt.
The authorization names another location
Ask the insurer or referring office whether the authorization must be updated before changing centers.
The order and authorization do not match
Do not assume the difference is harmless. The body part, exam type and contrast instructions should be consistent.
No complete public plan list
How to verify insurance and imaging costs
Diagnostic Medical Group’s public website does not provide a complete insurance-plan directory or standard price table. Coverage may depend on the specific center, exam, provider order, contrast material and authorization.
Call DMG with the complete plan name
Read the insurer, product, network, member ID and group number exactly as shown on the card.
Confirm the exact facility
Ask about the specific San Gabriel, Monterey Park, City of Industry or Arcadia address.
Confirm the exact test
MRI with contrast, MRI without contrast and MRI with and without contrast may be treated differently.
Check authorization
Ask who is responsible for obtaining approval: the referring office, imaging center or patient.
Ask the insurer for estimated cost-sharing
Request the deductible, coinsurance, copay and whether contrast or radiologist interpretation is included.
Record verification details
Save the date, representative name, reference number and the facility and exam that were discussed.
Insurance call script
“Please verify Diagnostic Medical Group at [exact address] for [exam, body part and contrast status]. Is the facility in network? Is prior authorization required? What deductible, copay or coinsurance applies, and will the radiologist or contrast be billed separately?”
An insurance approval is not the same as a price guarantee. Ask whether the estimate includes the imaging facility, contrast material and professional interpretation.
Prepare before leaving home
What to bring to Diagnostic Medical Group
Government-issued photo identification
Current primary and secondary insurance cards
Paper imaging order when provided
Insurance authorization details
Medication and supplement list
Allergy and contrast-reaction history
Kidney laboratory results when requested
Implant or medical-device information
Previous images and reports when requested
Interpreter or accessibility request information
Wear simple clothing when possible. Metal zippers, snaps, underwire, jewelry, hairpins and removable accessories can interfere with imaging or must be removed.
MRI safety comes first
How to prepare for a Diagnostic Medical Group MRI
DMG lists MRI at San Gabriel, Monterey Park and City of Industry. Monterey Park and City of Industry publish 1.5 Tesla systems.
Tell staff about every implanted device
Bring the device or implant information card
Report pacemakers, stimulators or pumps
Report aneurysm clips or cochlear implants
Report metal fragments, bullets or shrapnel
Tell staff about possible pregnancy
Report kidney disease before contrast
Discuss claustrophobia before the exam date
Remove jewelry and electronic devices
Follow the center’s food and medication instructions
MRI does not use X-rays
MRI creates detailed images using a strong magnetic field, radio waves and a computer.
Contrast may require screening
Staff may ask about kidney disease and may require a kidney-function blood test before gadolinium contrast.
Sedation changes transportation
If a doctor prescribes a sedative for claustrophobia, arrange a responsible adult driver and follow the medication instructions.
Never enter the MRI room with an unknown implant or metal object. The imaging team must confirm whether the device is safe under the scanner’s conditions.
64-slice CT locations
How to prepare for a DMG CT scan
Diagnostic Medical Group lists 64-slice CT scanners at Monterey Park and City of Industry.
Confirm whether contrast is ordered
CT contrast may be given by mouth, through an IV or by another route depending on the examination.
Ask whether fasting is required
Instructions vary by body part and contrast use. Follow DMG’s exact instructions rather than using a general fasting rule.
Report previous contrast reactions
Describe what happened, which contrast was used and whether treatment was required.
Report kidney disease and diabetes medicines
The center may need current kidney-function results or additional medication guidance.
Tell staff about possible pregnancy
CT uses ionizing radiation. The ordering provider and imaging team should evaluate the benefit and risk.
Remove metal from the scanned area
Jewelry, glasses, removable dental work, hairpins and clothing hardware may affect the images.
Do not stop prescription medicine on your own. Ask the ordering provider or imaging center specifically about diabetes medicine, blood thinners and any medicine affected by fasting.
Available at all four centers
Ultrasound preparation depends on the body part
Ultrasound is listed at San Gabriel, Monterey Park, City of Industry and Arcadia. It uses sound waves rather than ionizing radiation.
Abdominal examinations
Some abdominal ultrasound exams require fasting so food and bowel gas do not block the view. Ask for the exact number of fasting hours.
Pelvic or bladder examinations
Some exams require drinking water and keeping the bladder full. Confirm how much water to drink and when to stop urinating.
Other ultrasound exams
Thyroid, soft-tissue, vascular and several other exams may require little or no special preparation.
Do not guess between fasting and drinking water. The wrong preparation can delay the exam or make the images less useful. Ask DMG for instructions tied to the exact ultrasound order.
Digital breast imaging
How to prepare for a Diagnostic Medical Group mammogram
Digital mammography is listed at San Gabriel, Monterey Park and City of Industry. The FDA’s mammography-facility database also contains current Diagnostic Medical Group facility entries.
Do not apply deodorant on the exam day
Do not apply talcum powder under the arms
Do not apply lotion on the breasts or underarms
Tell staff about breast lumps or other symptoms
Report prior breast surgery or treatment
Tell staff about possible pregnancy
Bring prior mammograms from another facility
Ask whether the order is screening or diagnostic
Screening mammogram
Used for routine breast-cancer screening in a person without a new breast symptom.
Diagnostic mammogram
Used to evaluate a symptom or follow up an abnormal screening finding. It may require additional images or ultrasound.
Prior images are important. A radiologist can compare current and earlier mammograms to determine whether a finding is new, stable or changing.
Bone-density imaging
How to prepare for a DEXA bone-density scan
DEXA is listed at San Gabriel, Monterey Park and City of Industry. The exam uses a very small amount of ionizing radiation to measure bone mineral density, usually at the hip and lower spine.
Avoid calcium supplements for at least 24 hours unless instructed differently
Wear loose clothing without metal zippers or buttons
Tell staff about possible pregnancy
Report a recent barium examination
Report recent CT contrast or radioisotope imaging
Bring earlier DEXA reports when comparison is needed
Comparison tip: Follow-up bone-density testing is most useful when the same body areas and compatible equipment are used. Tell the referring provider where earlier DEXA scans were performed.
San Gabriel service
What to know before nuclear medicine imaging
Nuclear medicine is listed at the San Gabriel center. It uses a small amount of radioactive material called a radiotracer and a special camera to show how an organ, tissue or body process is functioning.
Tell staff about pregnancy or breastfeeding
List all prescriptions, vitamins and supplements
Report recent illness and medical conditions
Report allergies and earlier reactions
Ask about fasting or medicine restrictions
Ask how long the full appointment may take
Remove jewelry and interfering accessories
Ask whether there is a waiting period between injection and imaging
Plan for possible waiting time. Some nuclear-medicine studies require time for the radiotracer to circulate before the images are taken. Ask whether you may leave and return or must remain at the center.
Breastfeeding instructions are exam-specific. Do not assume feeding may continue normally after every radiotracer. Ask for written instructions before the injection.
X-ray and EKG routing
Where to obtain X-ray or EKG testing
X-ray availability
X-ray is listed at all four DMG centers. San Gabriel, City of Industry and Arcadia list digital radiography. Monterey Park lists computed radiography.
EKG availability
EKG is published only on the San Gabriel service list. Call San Gabriel to confirm scheduling, preparation and order requirements.
Arcadia X-ray schedule: The official location page lists X-ray on Monday, Tuesday and Thursday only. Call
626-566-3900 before traveling.
Most routine X-rays require little preparation. Remove jewelry and metal from the area being examined and tell the technologist about possible pregnancy.
Contrast and medication safety
Information to give the imaging team before contrast
Previous CT or MRI contrast reaction
The symptoms caused by the reaction
Kidney disease or reduced kidney function
Dialysis treatment
Diabetes and diabetes medicines
Pregnancy or breastfeeding
Asthma and serious allergies
Recent blood-test results when requested
CT and MRI contrast are not identical. CT commonly uses iodine-based contrast, while MRI commonly uses gadolinium-based contrast. A reaction to one does not automatically mean the same reaction will occur with the other, but the imaging team still needs the full history.
Get urgent help after a serious reaction. Severe breathing trouble, facial or throat swelling, fainting or rapidly worsening symptoms require immediate emergency attention.
Report workflow
How Diagnostic Medical Group imaging reports are requested
DMG’s public report-request form is designed to send the radiology report to the referring physician’s fax number already on file. This protects patient privacy but means the form does not function like an ordinary patient-download portal.
Select the DMG facility
Choose Arcadia, City of Industry, Monterey Park or San Gabriel.
Enter the patient’s name
Use the last and first name associated with the imaging registration.
Enter the date of birth
Use the month, day and four-digit year requested by the form.
Identify the referring physician
Enter the physician’s last and first name and office city.
Add office contact details when known
The form allows an optional contact person and physician-office phone number.
Enter the exam name
Be specific, such as MRI knee, CT abdomen or screening mammogram.
Submit the request
DMG states that the completed report will be faxed to the referring physician’s fax number on file.
Contact the referring office for interpretation
The ordering clinician should explain how the result relates to your symptoms, history and treatment plan.
Need the images rather than only the report? Call the location where the exam was completed and ask for its current image-release procedure. A written report and the actual image files are different records.
Troubleshooting
No appointment, order or report found? Check these causes
The order went to another DMG location
Confirm which fax number the referring office used and which center created the appointment.
The order is incomplete
The center may need the body part, side, contrast status, diagnosis or provider signature clarified.
Authorization is still pending
Ask the referring office and insurer whether approval has been submitted, approved or redirected.
The report is not ready
The images may still be awaiting radiologist interpretation or final signature.
The report was faxed to an old number
Ask the referring office to confirm that DMG has the correct fax number on file.
The doctor has the report but has not contacted you
Ask the office when the clinician will review it and how you will receive next-step instructions.
You need records for a new specialist
Ask whether the specialist needs the report, actual images or both.
Your symptoms became urgent
Do not wait for a routine report callback when severe symptoms require urgent or emergency evaluation.
Missing-report call script
“I completed [exam] at your [location] center on [date]. My name and date of birth are [details], and the referring provider is [name]. Is the report complete, and was it faxed to the referring office number on file? What should the physician office do if it was not received?”
Local San Gabriel Valley shortcuts
Practical tips that can prevent a wasted imaging trip
01
Match exam to location
Do not choose Arcadia for an MRI or CT based only on travel distance.
02
Save the suite number
The City of Industry center is listed in Suite 105, and Arcadia is listed in Suite A.
03
Verify Arcadia X-ray days
The public directory currently lists X-ray only on Monday, Tuesday and Thursday.
04
Ask about preparation twice
Confirm instructions when scheduling and again before the exam if the order or contrast status changes.
05
Bring previous images
Comparison may prevent unnecessary repeat imaging or help the radiologist understand a finding.
06
Check authorization
Do not assume the referring office has completed every insurance step.
07
Separate report from images
A report explains findings; an image file contains the actual scan pictures.
08
Use the direct location phone
Each center has its own phone and fax number, which helps avoid routing delays.
09
Do not wait on urgent symptoms
Outpatient imaging reports are not a substitute for emergency evaluation.
San Gabriel center map
Map to Diagnostic Medical Group San Gabriel
Diagnostic Medical Group of Southern California
1129 S. San Gabriel Boulevard
San Gabriel, CA 91776
Phone: 626-287-6746
This map shows the San Gabriel center only. Confirm that your appointment is not at Monterey Park, City of Industry or Arcadia before traveling.
Ten practical answers
Diagnostic Medical Group frequently asked questions
Which Diagnostic Medical Group does this guide cover?
This page covers Diagnostic Medical Group of Southern California, an outpatient imaging network with centers in San Gabriel, Monterey Park, City of Industry and Arcadia.
What imaging services does DMG provide?
Services vary by location and include MRI, CT, X-ray, ultrasound, digital mammography, DEXA bone density, nuclear medicine and EKG.
Which locations perform CT scans?
Monterey Park and City of Industry currently list 64-slice CT scanners.
Which locations perform MRI?
MRI is listed at San Gabriel, Monterey Park and City of Industry. Monterey Park and City of Industry specify 1.5 Tesla MRI.
Do I need an imaging order?
Most diagnostic imaging is arranged from an order issued by a medical provider. Confirm that the correct order and authorization have reached DMG before the appointment.
Does DMG have a patient portal?
The public website promotes a referring-physician portal rather than a universal patient portal. Its report-request form sends the report to the referring physician’s fax number on file.
How do I request my report?
Use DMG’s report-request form, select the center and enter the patient, referring physician and exam details. The report is then faxed to the physician number on file.
What should I report before MRI?
Tell staff about implants, pacemakers, stimulators, metal fragments, pregnancy, kidney disease, claustrophobia and previous contrast reactions.
What should I avoid before a mammogram?
Do not wear deodorant, talcum powder or lotion under the arms or on the breasts. Bring prior mammograms when they were performed elsewhere.
Does DMG publish prices or accepted insurance plans?
The public website does not provide a complete insurance or price table. Verify the exact location, exam, contrast, authorization and estimated cost with DMG and your insurer.
Final live actions
Official Diagnostic Medical Group tools
The important location, service and preparation details are explained above. Use the official website when you are ready to confirm a live service, contact a location or submit a report request.
