Dr. Gregory A. Johnson, MD
- Medicare services, 2024
- 2,134
- Medicare patients, 2024
- 512
- Part D claims, 2024
- 781
- Hospital affiliations
- 1
- Industry payments
- $13
- Practice address
- 111 Grossman Dr, Braintree, MA 02184
- Practice phone
- Call (617) 421-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Harvard Vanguard Medical Associates
Braintree, Massachusetts
Find Dr. Johnson's professional email, personal email and mobile number
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Dr. Gregory A. Johnson is an internist in Braintree, Massachusetts
Dr. Johnson practices at Harvard Vanguard Medical Associates in Braintree, Massachusetts.
Dr. Johnson's NPI, 1942213509, was assigned on August 14, 2006. Dr. Johnson graduated from Warren Alpert Medical School of Brown University in 1993. Dr. Johnson holds Massachusetts license 151587.
- NPI
- 1942213509NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2264452523
- NPI enumeration date
- August 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 421-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory A. Johnson practices at Harvard Vanguard Medical Associates in Braintree, Massachusetts
Dr. Johnson's primary practice is Harvard Vanguard Medical Associates, at 111 Grossman Dr, Braintree, MA 02184 in Norfolk County. The practice phone is (617) 421-1000.
- Harvard Vanguard Medical Associates111 Grossman Dr, Braintree, MA 02184 · Norfolk CountyPhone(617) 421-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory A. Johnson is affiliated with 3 sites of care and 1 medical group
Dr. Johnson's primary practice is Harvard Vanguard Medical Associates in Braintree, Massachusetts. Dr. Johnson is also affiliated with Beverly Hospital. The medical group on file is Atrius Health. Dmand AI also links Dr. Johnson to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory A. Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harvard Vanguard Medical Associates | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory A. Johnson is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Johnson is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Johnson
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. Gregory A. Johnson billed Medicare for 2,134 services in 2024
CMS data shows 2,134 Medicare services from Dr. Johnson across 24 procedure codes in 2024, for 512 Medicare patients. Medicare paid $64,805 for them. Every service was in an office.
Dr. Johnson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 9022024: 1,30745%
- Office and hospital visits
- 2023: 5672024: 6158%
- Surgery
- 2023: 1322024: 132No change
- Drugs given in the office
- 2023: 152024: 60300%
- Tests and treatments
- 2023: 122024: 2067%
- Other services
- 2023: 562024: 0100%
Dr. Johnson compared with the Massachusetts median for internists, 2024
- Dr. Johnson
- Massachusetts median
- Medicare services
- 2,134vs 4315.0 times
- Medicare patients
- 512vs 1942.6 times
- Part D claims
- 510vs 40227% above
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Johnson'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. Gregory A. Johnson treated 512 Medicare patients in 2024, average age 73
CMS counts 512 Medicare patients who saw Dr. Johnson in 2024. The largest group is 75 to 84, with 215 patients. 71% of them have high cholesterol, and 65% have high blood pressure. 14% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnson's median patient age at 51, with 60% women.
Dr. Johnson's Medicare patients by age, 2024
Dr. Johnson's Medicare patients by sex, 2024
- Women31161%
- Men20139%
Chronic conditions among Dr. Johnson's Medicare patients, 2024
- High cholesterol71%
- High blood pressure65%
- Arthritis46%
- Mood disorders31%
- Diabetes29%
- Anxiety28%
- Chronic kidney disease28%
- Depression27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory A. Johnson wrote 781 Medicare Part D claims in 2024
In 2024, Dr. Johnson wrote 781 Medicare Part D claims for 577 patients. 91% of them were for generic drugs. CMS names the drug for 510 of them, across 21 drugs with 11 or more claims each, at $4,363 in total drug cost. In 2023, CMS named 1,404 claims across 39 drugs.
Dr. Johnson's Part D claims by kind of drug, 2024
- Generic712 claims91%
- Brand-name and other69 claims9%
Dr. Johnson'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. Johnson's Part D claims, 2024
- Opioids3%22 of 781 claims
- Antibiotics40%310 of 781 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: 1,4042024: 51064%
Drugs named by CMS: 21 in 2024, 39 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
How Dr. Gregory A. Johnson takes part in Medicare
Dr. Johnson accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory A. Johnson received $13 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Johnson from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Arbor Pharmaceuticals, Inc. paid the most, $13.
Companies that paid Dr. Johnson the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory A. Johnson graduated from Warren Alpert Medical School of Brown University
Dr. Johnson graduated from Warren Alpert Medical School of Brown University in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory A. Johnson'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) |
| Industry payments | Open Payments (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. Gregory A. Johnson
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. Gregory A. Johnson's NPI number?
Dr. Gregory A. Johnson's NPI number is 1942213509. It was assigned on August 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory A. Johnson?
Dr. Gregory A. Johnson is an internist in Braintree, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gregory A. Johnson practice?
Dr. Johnson practices at 111 Grossman Dr, Braintree, MA 02184. Dr. Johnson's primary practice is Harvard Vanguard Medical Associates in Braintree, Massachusetts. Dmand AI also links Dr. Johnson to 1 group practice or clinic.
What is Dr. Gregory A. Johnson's office phone number?
The practice phone on file for Dr. Johnson is (617) 421-1000.
What is Dr. Gregory A. Johnson's medical license number?
Dr. Johnson holds Massachusetts license 151587.
Which hospitals is Dr. Gregory A. Johnson affiliated with?
Dr. Johnson is affiliated with Beverly Hospital.
What medical group is Dr. Gregory A. Johnson part of?
Dr. Johnson is linked to Atrius Health.
Does Dr. Gregory A. Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 2,134 services in 2024, and Dr. Johnson accepts Medicare assignment.
How many Medicare patients does Dr. Gregory A. Johnson see?
CMS counts 512 Medicare patients who saw Dr. Johnson in 2024, with an average age of 73.
What services does Dr. Gregory A. Johnson bill to Medicare?
In 2024, Dr. Johnson's most billed Medicare services were office visit, established patient (99213), lab and pathology test (87804) and lab and pathology test (87426).
Show 4 more questionsShow fewer questions
Where did Dr. Gregory A. Johnson go to medical school?
Dr. Johnson graduated from Warren Alpert Medical School of Brown University in 1993.
What drugs does Dr. Gregory A. Johnson prescribe most?
In 2024 Medicare Part D data, Dr. Johnson's most prescribed drugs by claims were Doxycycline Monohydrate, Prednisone and Amoxicillin-Clavulanate Potass.
Has Dr. Gregory A. Johnson received payments from drug or device companies?
CMS Open Payments shows $13 in general payments to Dr. Johnson from 1 company from 2016 to 2016. The largest total came from Arbor Pharmaceuticals, Inc.
How long has Dr. Gregory A. Johnson been practicing?
Dr. Johnson graduated from medical school in 1993, 33 years ago.
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