Dr. Karen J. Blumenthal, MD
- Medicare services, 2024
- 358
- Medicare patients, 2024
- 180
- Part D claims, 2024
- 752
- Hospital affiliations
- 6
- Medical groups
- 2
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Blumenthal's professional email, personal email and mobile number
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Dr. Karen J. Blumenthal is an internist in Boston, Massachusetts
Dr. Blumenthal practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Blumenthal's NPI, 1922362482, was assigned on June 29, 2012. Dr. Blumenthal graduated from Perelman School of Med at the University of Pennsylvania in 2012. Dr. Blumenthal holds Massachusetts license L-251289.
- NPI
- 1922362482NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840444345
- NPI enumeration date
- June 29, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Karen J. Blumenthal practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Blumenthal's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. Karen J. Blumenthal is affiliated with 10 sites of care and 2 medical groups
Dr. Blumenthal's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dr. Blumenthal is also affiliated with Massachusetts Eye and Ear. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Blumenthal to 4 more hospitals, 2 group practices and clinics, 1 community health center, 1 home health agency and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Karen J. Blumenthal's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Blumenthal practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +9 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Karen J. Blumenthal is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Blumenthal's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Blumenthal is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Blumenthal
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. Karen J. Blumenthal billed Medicare for 358 services in 2024
CMS data shows 358 Medicare services from Dr. Blumenthal across 7 procedure codes in 2024, for 180 Medicare patients. Medicare paid $22,021 for them.
Dr. Blumenthal's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1652024: 18311%
- Other services
- 2023: 442024: 89102%
- Surgery
- 2023: 762024: 751%
- Tests and treatments
- 2023: 112024: 11No change
Where Dr. Blumenthal's Medicare services took place, 2024
- In an office28078%
- In a facility7822%
Dr. Blumenthal compared with the Massachusetts median for internists, 2024
- Dr. Blumenthal
- Massachusetts median
- Medicare services
- 358vs 43117% below
- Medicare patients
- 180vs 1947% below
- Part D claims
- 412vs 402Close to median
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Blumenthal'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Karen J. Blumenthal treated 180 Medicare patients in 2024, average age 74
CMS counts 180 Medicare patients who saw Dr. Blumenthal in 2024. The largest group is 65 to 74, with 75 patients. 71% of them have high cholesterol, and 65% have high blood pressure. 27% are also on Medicaid. Their average risk score is 1.24, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Blumenthal's median patient age at 65, with 71% women.
Dr. Blumenthal's Medicare patients by age, 2024
Dr. Blumenthal's Medicare patients by sex, 2024
- Women11765%
- Men6335%
Chronic conditions among Dr. Blumenthal's Medicare patients, 2024
- High cholesterol71%
- High blood pressure65%
- Arthritis49%
- Anxiety31%
- Mood disorders30%
- Osteoporosis29%
- Depression25%
- Diabetes25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Blumenthal's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women71%
- Men28%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Karen J. Blumenthal wrote 752 Medicare Part D claims in 2024
In 2024, Dr. Blumenthal wrote 752 Medicare Part D claims for 124 patients. 89% of them were for generic drugs. CMS names the drug for 412 of them, across 15 drugs with 11 or more claims each, at $4,548 in total drug cost. In 2023, CMS named 417 claims across 16 drugs.
Dr. Blumenthal's Part D claims by kind of drug, 2024
- Generic669 claims89%
- Brand-name and other83 claims11%
Dr. Blumenthal'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. Blumenthal's Part D claims, 2024
- Antibiotics2%16 of 752 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: 4172024: 4121%
Drugs named by CMS: 15 in 2024, 16 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. Karen J. Blumenthal offers telehealth to Medicare patients
Dr. Blumenthal accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Blumenthal as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Karen J. Blumenthal graduated from Perelman School of Med at the University of Pennsylvania
Dr. Blumenthal graduated from Perelman School of Med at the University of Pennsylvania in 2012.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Karen J. Blumenthal'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Karen J. Blumenthal
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. Karen J. Blumenthal's NPI number?
Dr. Karen J. Blumenthal's NPI number is 1922362482. It was assigned on June 29, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Karen J. Blumenthal?
Dr. Karen J. Blumenthal is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Karen J. Blumenthal practice?
Dr. Blumenthal practices at 55 Fruit Street, Boston, MA 02114. Dr. Blumenthal's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Blumenthal to 4 hospitals, 2 group practices and clinics, 1 community health center, 1 home health agency and 1 medical group.
What is Dr. Karen J. Blumenthal's office phone number?
The practice phone on file for Dr. Blumenthal is (617) 726-2000.
What is Dr. Karen J. Blumenthal's medical license number?
Dr. Blumenthal holds Massachusetts license L-251289.
Which hospitals is Dr. Karen J. Blumenthal affiliated with?
Dr. Blumenthal practices at Massachusetts General Hospital in Boston, Massachusetts. Dr. Blumenthal is also affiliated with Massachusetts Eye and Ear. Dmand AI links Dr. Blumenthal to 4 more hospitals.
What medical group is Dr. Karen J. Blumenthal part of?
Dr. Blumenthal is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Blumenthal to 1 more medical group.
Does Dr. Karen J. Blumenthal accept Medicare?
Yes. CMS data shows Dr. Blumenthal billed Medicare for 358 services in 2024, and Dr. Blumenthal accepts Medicare assignment.
Does Dr. Karen J. Blumenthal offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Blumenthal as offering telehealth services.
How many Medicare patients does Dr. Karen J. Blumenthal see?
CMS counts 180 Medicare patients who saw Dr. Blumenthal in 2024, with an average age of 74.
Show 4 more questionsShow fewer questions
What services does Dr. Karen J. Blumenthal bill to Medicare?
In 2024, Dr. Blumenthal's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and office visit, established patient (99213).
Where did Dr. Karen J. Blumenthal go to medical school?
Dr. Blumenthal graduated from Perelman School of Med at the University of Pennsylvania in 2012.
What drugs does Dr. Karen J. Blumenthal prescribe most?
In 2024 Medicare Part D data, Dr. Blumenthal's most prescribed drugs by claims were Atorvastatin Calcium, Omeprazole and Rosuvastatin Calcium.
How long has Dr. Karen J. Blumenthal been practicing?
Dr. Blumenthal graduated from medical school in 2012, 14 years ago.
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