R I Med J (2013)
Dr. Margret W. Chang, MD
NPI1902124282PAC ID2062630080
- Medicare services, 2024
- 241
- Medicare patients, 2024
- 125
- Part D claims, 2024
- 2,863
- Publications
- 1
- Hospital affiliations
- 2
- Practice address
- 55 North Ave, Mendon, MA 01756
- Practice phone
- Call (508) 334-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Umass Memorial Medical Center
Mendon, Massachusetts
Find Dr. Chang's professional email, personal email and mobile number
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Dr. Margret W. Chang is an internist in Mendon, Massachusetts
Dr. Chang practices at Umass Memorial Medical Center in Mendon, Massachusetts.
Dr. Chang's NPI, 1902124282, was assigned on May 11, 2010. Dr. Chang holds Massachusetts license 258551.
NPI and contact details
- NPI
- 1902124282NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062630080
- NPI enumeration date
- May 11, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (508) 334-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Margret W. Chang practices at Umass Memorial Medical Center in Mendon, Massachusetts
Dr. Chang's primary practice is Umass Memorial Medical Center, at 55 North Ave, Mendon, MA 01756 in Worcester County. The practice phone is (508) 334-1000.
- Umass Memorial Medical Center55 North Ave, Mendon, MA 01756 · Worcester CountyPhone(508) 334-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Margret W. Chang is affiliated with 7 sites of care and 2 medical groups
Dr. Chang's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dr. Chang is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is UMass Memorial Medical Group. Dmand AI also links Dr. Chang to 1 more hospital, 2 group practices and clinics, 2 home health agencies and 1 medical group, each named with a free account.
Umass Memorial Medical CenterPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Margret W. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Umass Memorial Medical Center | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Margret W. Chang is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chang is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Chang
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Margret W. Chang billed Medicare for 241 services in 2024
CMS data shows 241 Medicare services from Dr. Chang across 5 procedure codes in 2024, for 125 Medicare patients. Medicare paid $12,000 for them. Every service was in an office.
Medicare services, 2024241
Medicare patients125
Paid by Medicare$12,000
Procedure codes5
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1422024: 16315%
- Other services
- 2023: 562024: 7839%
Dr. Chang compared with the Massachusetts median for internists, 2024
- Dr. Chang
- Massachusetts median
- Medicare services
- 241vs 43144% below
- Medicare patients
- 125vs 19436% below
- Part D claims
- 2,368vs 4025.9 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Margret W. Chang treated 125 Medicare patients in 2024, average age 67
CMS counts 125 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 53 patients. 60% of them have high blood pressure, and 54% have high cholesterol. 45% are also on Medicaid. Their average risk score is 1.42, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 53, with 65% women.
Medicare patients, 2024125
Average age67
Average risk score1.42
Also on Medicaid45%
Dr. Chang's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chang's Medicare patients by sex, 2024
- Women7963%
- Men4637%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure60%
- High cholesterol54%
- Anxiety45%
- Mood disorders45%
- Depression41%
- Arthritis34%
- Diabetes30%
- Ischemic heart disease22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 53
Patient panel by sex, all payers
- Women65%
- Men35%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Margret W. Chang wrote 2,863 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 2,863 Medicare Part D claims for 179 patients. 91% of them were for generic drugs. CMS names the drug for 2,368 of them, across 72 drugs with 11 or more claims each, at $88,580 in total drug cost. In 2023, CMS named 2,496 claims across 73 drugs.
Part D claims, 20242,863
Drugs named by CMS72
Total drug cost$88,580
Part D patients179
Dr. Chang's Part D claims by kind of drug, 2024
- Generic2,609 claims91%
- Brand-name and other254 claims9%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chang's Part D claims, 2024
- Opioids9%260 of 2,863 claims
- Antibiotics1%26 of 2,863 claims
- Antipsychotics, patients 65 and over1%18 of 2,863 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,4962024: 2,3685%
Drugs named by CMS: 72 in 2024, 73 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Margret W. Chang offers telehealth to Medicare patients
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chang as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Margret W. Chang has 1 publication on record
Dmand AI links 1 paper to Dr. Chang in 2017. Dr. Chang's most frequent co-authors are Eric Jessen Chow, MD and Jackie Hsieh.
Papers1
Dr. Chang's most frequent co-authors
Recent publications by Dr. Chang
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Margret W. Chang received $130 in industry payments from 2016 to 2024
CMS Open Payments shows 3 general payments to Dr. Chang from 3 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Ipsen Biopharmaceuticals, Inc paid the most, $86.
General payments to Dr. Chang by program year, 2016 to 2024
Companies that paid Dr. Chang the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Margret W. Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Margret W. Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Margret W. Chang's NPI number?
Dr. Margret W. Chang's NPI number is 1902124282. It was assigned on May 11, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Margret W. Chang?
Dr. Margret W. Chang is an internist in Mendon, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Margret W. Chang practice?
Dr. Chang practices at 55 North Ave, Mendon, MA 01756. Dr. Chang's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dmand AI also links Dr. Chang to 1 hospital, 2 group practices and clinics, 2 home health agencies and 1 medical group.
What is Dr. Margret W. Chang's office phone number?
The practice phone on file for Dr. Chang is (508) 334-1000.
What is Dr. Margret W. Chang's medical license number?
Dr. Chang holds Massachusetts license 258551.
Which hospitals is Dr. Margret W. Chang affiliated with?
Dr. Chang is affiliated with UMass Memorial Medical Center - University Campus. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Margret W. Chang part of?
Dr. Chang is linked to UMass Memorial Medical Group. Dmand AI links Dr. Chang to 1 more medical group.
Does Dr. Margret W. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 241 services in 2024, and Dr. Chang accepts Medicare assignment.
Does Dr. Margret W. Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chang as offering telehealth services.
How many Medicare patients does Dr. Margret W. Chang see?
CMS counts 125 Medicare patients who saw Dr. Chang in 2024, with an average age of 67.
Show 6 more questionsShow fewer questions
What services does Dr. Margret W. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and office visit, established patient (99213).
What drugs does Dr. Margret W. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Oxycodone HCl, Atorvastatin Calcium and Omeprazole.
Has Dr. Margret W. Chang received payments from drug or device companies?
CMS Open Payments shows $130 in general payments to Dr. Chang from 3 companies from 2016 to 2024. The largest total came from Ipsen Biopharmaceuticals, Inc.
How long has Dr. Margret W. Chang been practicing?
Dr. Chang graduated from medical school in 2010, 16 years ago.
Does Dr. Margret W. Chang do research?
Dmand AI links 1 publication to Dr. Chang.
Who does Dr. Margret W. Chang publish with?
Dr. Chang's most frequent co-authors are Eric Jessen Chow, MD (1 shared paper) and Jackie Hsieh (1 shared paper).
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