NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1396721841 M.D.
Verify on CMS → Harrison Farber, M.D.
Internal Medicine Physician in Boston, 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 172,737 in Internal Medicine Physician, 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
2K
Medicare Part D claims · 128 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
60%
generic claims · 40% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$30.7K
82 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Harrison Farber, M.D. filed 1,573 Medicare Part D claims in 2023 as an Internal Medicine Physician in Boston, Massachusetts, prescribing 60% generic.
- 2K
- Part D claims, 2023
- 60%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Harrison Farber, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,573 Top 19% higher than 81% 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
✓
Board certification likely (heuristic, not verified)
Harrison Farber, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Harrison Farber, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
1,573 42% vs specialty avg
Specialty distribution in Massachusetts
How Internal Medicine Physician 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 Internal Medicine Physician. 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).
Harrison Farber, M.D. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding M.D. credentials at 725 ALBANY ST, Boston, MA, 02118, with a listed phone of (617) 638-7480. NPI 1396721841 was issued on 12/16/2005.
Medicare Part D records for calendar year 2023 show 1,573 prescription claims written by this provider, covering 128 Medicare beneficiaries and totaling roughly $9.7 million in drug spend, split 40% brand-name and 60% generic by claim count.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1396721841 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/16/2005 |
Hospital and facility affiliations
Facilities where Harrison Farber, 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.
Pratt Medical Group Inc
Boston, 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).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Harrison Farber, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$30.7K
Largest payer
United Therapeutics Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Harrison Farber, M.D.. To verify Harrison Farber, 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.
Brand vs generic prescribing mix · Above average
Harrison Farber, M.D. - brand share 40.0%
Internal Medicine Physician average
40% brand-name claims vs 60% generic, on 1,573 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,573
Total Claims
$9.7M
Total Drug Cost
128
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,885
- Total Day Supply
- 54,828
- Brand vs Generic
- 40% brand / 60% generic
- Brand Drug Cost
- $8.0M
- Generic Drug Cost
- $1.7M
- Antibiotic Claims
- 24
Patient Demographics
- Average Patient Age
- 69.2 years
- Avg HCC Risk Score
- 2.88
- Gender Split
- 63% female / 38% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Harrison Farber, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ambrisentan
Ambrisentan
258 claims
- Tadalafil
Tadalafil
236 claims
- Opsumit
Opsumit
172 claims
- Alyq
Alyq
126 claims
- Uptravi 98
Uptravi
98 claims
- Adempas 82
Adempas
82 claims
- Furosemide 75
Furosemide
75 claims
- Tyvaso Dpi 62
Tyvaso Dpi
62 claims
| Drug | Claims |
|---|---|
| Ambrisentan | 258 |
| Tadalafil | 236 |
| Opsumit Macitentan | 172 |
| Alyq Tadalafil | 126 |
| Uptravi Selexipag | 98 |
| Adempas Riociguat | 82 |
| Furosemide | 75 |
| Tyvaso Dpi Treprostinil | 62 |
| Adcirca Tadalafil | 48 |
| Sildenafil Citrate | 41 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Harrison Farber, M.D. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Harrison Farber, M.D.'s 1,573 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Farber.
Dr. Nawal Aamir
MD
Worcester, MA
Zainab Abbas
Worcester, MA
Dr. Nooshin Abbasi
MD MPH
Newton, MA
Dr. Lauren Abbate
MD
Boston, MA
Dr. Bassima Abdallah
MD
Boston, MA
Compare Internal Medicine Physician 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 Internal Medicine Physician 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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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Harrison Farber, M.D.'s specialty? ▼
Harrison Farber, M.D. specializes in Internal Medicine Physician and practices in Boston, Massachusetts. Credentials: M.D..
How much does Harrison Farber, M.D. prescribe under Medicare Part D? ▼
In 2023, Harrison Farber, M.D. wrote 1,573 Medicare Part D claims totaling $9.7M in drug costs for 128 beneficiaries.
Where is Harrison Farber, M.D. located? ▼
Harrison Farber, M.D. is located at 725 ALBANY ST, Boston, MA, 02118. Phone: (617) 638-7480.
What is Harrison Farber, M.D.'s NPI number? ▼
Harrison Farber, M.D.'s National Provider Identifier (NPI) is 1396721841, issued on 12/16/2005.
Does Harrison Farber, M.D. prescribe more brand-name or generic drugs? ▼
Harrison Farber, M.D.'s prescribing is 40% brand-name and 60% generic drugs by claim count, with $8.0M in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Harrison Farber, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Harrison Farber, M.D.'s most frequently prescribed drugs include Ambrisentan, Tadalafil, Opsumit. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Harrison Farber, M.D. accept Medicare? ▼
Harrison Farber, M.D. appears in CMS Medicare data with 1,573 Part D claims and 128 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Harrison Farber, M.D.'s credentials? ▼
Harrison Farber, M.D.'s NPI is 1396721841 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
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.