NPI registry status
Active
2026 NPPES data Anatomic Pathology & Clinical Pathology Physician NPI 1063435584 M.D.
Verify on CMS → Eric Diamond, M.D.
Anatomic Pathology & Clinical Pathology Physician in Greenwich, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 13,692 in Anatomic Pathology & Clinical Pathology 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
17
Medicare Part D claims · Anatomic Pathology & Clinical Pathology Physician avg: 284
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Eric Diamond, M.D. filed 17 Medicare Part D claims in 2023 as a Anatomic Pathology & Clinical Pathology Physician in Greenwich, Connecticut.
- 17
- 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.
Eric Diamond, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
17 0th percentile higher than 0% 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-eligible specialty (heuristic, not verified)
Eric Diamond, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Eric Diamond, M.D.?
Quality data not reportedPrimary specialty
Anatomic Pathology & Clinical Pathology Physician
Medicare Part D claims
17 94% vs specialty avg
Specialty distribution in Connecticut
How Anatomic Pathology & Clinical Pathology Physician compares to other specialties among Connecticut 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 Anatomic Pathology & Clinical Pathology 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).
Eric Diamond, M.D. appears in the CMS NPPES registry as a Anatomic Pathology & Clinical Pathology Physician provider holding M.D. credentials at 5 PERRYRIDGE RD, Greenwich, CT, 06830, with a listed phone of (203) 863-3061. NPI 1063435584 was issued on 07/25/2006.
Medicare Part D records for calendar year 2023 show 17 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $213 in drug spend.
Anatomic Pathology & Clinical Pathology Physician is a mid-sized specialty nationwide, with 13,692 enrolled providers across 55 states and an average of 284 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 | 1063435584 |
|---|---|
| Specialty | Anatomic Pathology & Clinical Pathology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/25/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
17
Total Claims
$213
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 21
- Total Day Supply
- 357
- Generic Drug Cost
- $163
Patient Demographics
- Average Patient Age
- 75.0 years
- Avg HCC Risk Score
- 0.69
More Anatomic Pathology & Clinical Pathology Physician in CT →
All providers in Connecticut →
Compare specialties →
Anatomic Pathology & Clinical Pathology Physician Overview
How Eric Diamond, M.D. fits within the Anatomic Pathology & Clinical Pathology Physician landscape nationally.
13,692
Anatomic Pathology & Clinical Pathology Physician Providers in US
55
States with Anatomic Pathology & Clinical Pathology Physician
284
Avg Claims per Provider
Eric Diamond, M.D.'s 17 claims are below the specialty average of 284.
Nearby Anatomic Pathology & Clinical Pathology Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Diamond.
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 Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Anatomic Pathology & Clinical Pathology 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
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
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 Connecticut
Frequently Asked Questions
What is Eric Diamond, M.D.'s specialty? ▼
Eric Diamond, M.D. specializes in Anatomic Pathology & Clinical Pathology Physician and practices in Greenwich, Connecticut. Credentials: M.D..
How much does Eric Diamond, M.D. prescribe under Medicare Part D? ▼
In 2023, Eric Diamond, M.D. wrote 17 Medicare Part D claims totaling $213 in drug costs for N/A beneficiaries.
Where is Eric Diamond, M.D. located? ▼
Eric Diamond, M.D. is located at 5 PERRYRIDGE RD, Greenwich, CT, 06830. Phone: (203) 863-3061.
What is Eric Diamond, M.D.'s NPI number? ▼
Eric Diamond, M.D.'s National Provider Identifier (NPI) is 1063435584, issued on 07/25/2006.
How many Anatomic Pathology & Clinical Pathology Physician providers are there in the US? ▼
There are 13,692 Anatomic Pathology & Clinical Pathology Physician providers across 55 states in the US. The average Anatomic Pathology & Clinical Pathology Physician provider writes 284 Medicare Part D claims per year.
Does Eric Diamond, M.D. accept Medicare? ▼
Eric Diamond, M.D. appears in CMS Medicare data with 17 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Eric Diamond, M.D.'s credentials? ▼
Eric Diamond, M.D.'s NPI is 1063435584 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.