NPI registry status
Active
2026 NPPES data Specialist NPI 1922049402 M.D.
Verify on CMS → Gregory Johnson, M.D.
Specialist in Haverhill, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,608 in Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
136
Medicare Part D claims · 71 beneficiaries · Specialist avg: 1K
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gregory Johnson, M.D. filed 136 Medicare Part D claims in 2023 as a Specialist in Haverhill, Massachusetts.
- 136
- Part D claims, 2023
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Gregory Johnson, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
136 35th percentile higher than 35% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Gregory Johnson, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
136 91% vs specialty avg
Specialty distribution in Massachusetts
How Specialist compares to other specialties among Massachusetts providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Specialist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Gregory Johnson, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 288 GROVELAND ST, Haverhill, MA, 01830, with a listed phone of (978) 373-3851. NPI 1922049402 was issued on 06/08/2006.
Medicare Part D records for calendar year 2023 show 136 prescription claims written by this provider, covering 71 Medicare beneficiaries and totaling roughly $1K in drug spend, with an opioid prescribing rate of 9.6%.
Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1922049402 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/08/2006 |
Hospital and facility affiliations
Facilities where Gregory Johnson, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Mass General Brigham Community Physicians Inc
North Andover, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Gregory Johnson, M.D.. To verify Gregory Johnson, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
136
Total Claims
$1K
Total Drug Cost
71
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 148
- Total Day Supply
- 2,068
- Brand Drug Cost
- $0
- Generic Drug Cost
- $1K
- Opioid Claims
- 13 (9.6% rate)
- Antibiotic Claims
- 63
Patient Demographics
- Average Patient Age
- 70.5 years
- Avg HCC Risk Score
- 0.99
- Gender Split
- 66% female / 34% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Johnson, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amoxicillin
Amoxicillin
60 claims
- Celecoxib
Celecoxib
24 claims
- Diclofenac Sodium 12
Diclofenac Sodium
12 claims
- Oxycodone Hcl 11
Oxycodone Hcl
11 claims
| Drug | Claims |
|---|---|
| Amoxicillin | 60 |
| Celecoxib | 24 |
| Diclofenac Sodium | 12 |
| Oxycodone Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Gregory Johnson, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Gregory Johnson, M.D.'s 136 claims are below the specialty average of 1,474.
Nearby Specialist Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Johnson.
Dr. Bruce Abbott
MD
New Bedford, MA
Dr. Sylvie Abi-Younes
M.D.
Norwood, MA
Dr. Funlola Aboderin
M.D.
Boston, MA
Dr. Henry Abraham
M.D.
Lexington, MA
Dr. Pamela Abrams-Warnick
LICSW
Brockton, MA
Compare Specialist nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Specialist peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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How to Find a Doctor
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Massachusetts
Frequently Asked Questions
What is Gregory Johnson, M.D.'s specialty? ▼
Gregory Johnson, M.D. specializes in Specialist and practices in Haverhill, Massachusetts. Credentials: M.D..
How much does Gregory Johnson, M.D. prescribe under Medicare Part D? ▼
In 2023, Gregory Johnson, M.D. wrote 136 Medicare Part D claims totaling $1K in drug costs for 71 beneficiaries.
Where is Gregory Johnson, M.D. located? ▼
Gregory Johnson, M.D. is located at 288 GROVELAND ST, Haverhill, MA, 01830. Phone: (978) 373-3851.
What is Gregory Johnson, M.D.'s NPI number? ▼
Gregory Johnson, M.D.'s National Provider Identifier (NPI) is 1922049402, issued on 06/08/2006.
Does Gregory Johnson, M.D. prescribe opioids? ▼
Yes, Gregory Johnson, M.D. had 13 opioid claims in 2023 with an opioid prescribing rate of 9.6%.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Gregory Johnson, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Johnson, M.D.'s most frequently prescribed drugs include Amoxicillin, Celecoxib, Diclofenac Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Johnson, M.D. accept Medicare? ▼
Gregory Johnson, M.D. appears in CMS Medicare data with 136 Part D claims and 71 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Johnson, M.D.'s credentials? ▼
Gregory Johnson, M.D.'s NPI is 1922049402 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.