NPI registry status
Active
2026 NPPES data Endocrinology, Diabetes & Metabolism Physician NPI 1649349010 MD
Verify on CMS → Harry Gruenspan, MD
Endocrinology, Diabetes & Metabolism Physician in New York, New York.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 8,078 in Endocrinology, Diabetes & Metabolism 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 · 139 beneficiaries · Endocrinology, Diabetes & Metabolism Physician avg: 3K
Generic prescribing
76%
generic claims · 22% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Harry Gruenspan, MD filed 1,629 Medicare Part D claims in 2024 as an Endocrinology, Diabetes & Metabolism Physician in New York, New York, prescribing 76% generic.
- 2K
- Part D claims, 2024
- 76%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥81st
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Harry Gruenspan, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1649349010), first enumerated 11/07/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,629 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
New York statewide board action statistics are published annually — these figures describe aggregate state activity, not Harry Gruenspan, MD's individual license status. Verify directly with the state medical board.
Source: NYSBPMC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1649349010 · Endocrinology, Diabetes & Metabolism Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1649349010
- ENUM-LEGACY 2006
- TAX-MID 8K Endocrinology, Diabetes
- RX-MID 1,629
- BOOK-LIGHT 813 in New York
- PHOTO-ENUM Karla Pou · 2006
Harry Gruenspan, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,629 ≥ 81st percentile 81% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Harry Gruenspan, MD 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 Harry Gruenspan, MD?
Quality data not reportedPrimary specialty
Endocrinology, Diabetes & Metabolism Physician
Medicare Part D claims
1,629 41% vs specialty avg
Specialty distribution in New York
How Endocrinology, Diabetes & Metabolism Physician compares to other specialties among New York 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 Endocrinology, Diabetes & Metabolism 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).
Practice Address
Provider Details
| NPI | 1649349010 |
|---|---|
| Specialty | Endocrinology, Diabetes & Metabolism Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/07/2006 |
Hospital and facility affiliations
Facilities where Harry Gruenspan, MD 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.
Maiden Lane Medical PLLC
New York, NY
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 - New York NYSBPMC 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 ~100K New York medical licensees in 2023 - they are NOT specific to Harry Gruenspan, MD. To verify Harry Gruenspan, MD's current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases
NYSBPMC 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 New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Harry Gruenspan, MD - brand share 22.0%
Endocrinology, Diabetes & Metabolism Physician average
22% brand-name claims vs 76% generic, on 1,629 2024 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 2024.
1,629
Total Claims
$420K
Total Drug Cost
139
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,160.967
- Total Day Supply
- 123,756
- Brand vs Generic
- 22% brand / 76% generic
- Brand Drug Cost
- $389K
- Generic Drug Cost
- $28K
- Opioid Claims
- 12 (0.7% rate)
- Antibiotic Claims
- 15
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 1.03
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Harry Gruenspan, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Metformin Hcl
Metformin Hcl
137 claims
- Levothyroxine Sodium
Levothyroxine Sodium
129 claims
- Ezetimibe
Ezetimibe
113 claims
- Atorvastatin Calcium
Atorvastatin Calcium
106 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
105 claims
- Telmisartan
Telmisartan
80 claims
- Ozempic
Ozempic
76 claims
- Losartan Potassium
Losartan Potassium
61 claims
| Drug | Claims |
|---|---|
| Metformin Hcl | 137 |
| Levothyroxine Sodium | 129 |
| Ezetimibe | 113 |
| Atorvastatin Calcium | 106 |
| Rosuvastatin Calcium | 105 |
| Telmisartan | 80 |
| Ozempic Semaglutide | 76 |
| Losartan Potassium | 61 |
| Amlodipine Besylate | 60 |
| Jardiance Empagliflozin | 48 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Endocrinology, Diabetes & Metabolism Physician in NY →
All providers in New York →
Compare specialties →
Endocrinology, Diabetes & Metabolism Physician Overview
How Harry Gruenspan, MD fits within the Endocrinology, Diabetes & Metabolism Physician landscape nationally.
8,078
Endocrinology, Diabetes & Metabolism Physician Providers in US
54
States with Endocrinology, Diabetes & Metabolism Physician
2,739
Avg Claims per Provider
Harry Gruenspan, MD's 1,629 claims are below the specialty average of 2,739.
Nationwide Endocrinology, Diabetes & Metabolism Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Gruenspan, both outside New York so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Endocrinology, Diabetes & Metabolism Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Gruenspan.
One of 813 Endocrinology, Diabetes & Metabolism Physician providers enrolled in New York, 5 are shown here.
Dr. Zinoviy Abelev
MD
Long Island City, NY
Dr. Jill Abelseth
M.D.
Albany, NY
Dr. Sherley Abraham
M.D.
New York, NY
Dr. Connor Abramowicz
DO
Port Jefferson, NY
Dr. Jennifer Abrams
DO
Brooklyn, NY
Compare Endocrinology, Diabetes & Metabolism Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Harry Gruenspan, MD's specialty? ▼
Harry Gruenspan, MD specializes in Endocrinology, Diabetes & Metabolism Physician and practices in New York, New York. Credentials: MD.
How much does Harry Gruenspan, MD prescribe under Medicare Part D? ▼
In 2024, Harry Gruenspan, MD wrote 1,629 Medicare Part D claims totaling $420K in drug costs for 139 beneficiaries.
Where is Harry Gruenspan, MD located? ▼
Harry Gruenspan, MD is located at 210 E 86TH ST, New York, NY, 10028. Phone: (212) 794-2900.
What is Harry Gruenspan, MD's NPI number? ▼
Harry Gruenspan, MD's National Provider Identifier (NPI) is 1649349010, issued on 11/07/2006.
Does Harry Gruenspan, MD prescribe more brand-name or generic drugs? ▼
Harry Gruenspan, MD's prescribing is 22% brand-name and 76% generic drugs by claim count, with $389K in brand drug costs.
Does Harry Gruenspan, MD prescribe opioids? ▼
Yes, Harry Gruenspan, MD had 12 opioid claims in 2024 with an opioid prescribing rate of 0.7%.
How many Endocrinology, Diabetes & Metabolism Physician providers are there in the US? ▼
There are 8,078 Endocrinology, Diabetes & Metabolism Physician providers across 54 states in the US. The average Endocrinology, Diabetes & Metabolism Physician provider writes 2,739 Medicare Part D claims per year.
What drugs does Harry Gruenspan, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Harry Gruenspan, MD's most frequently prescribed drugs include Metformin Hcl, Levothyroxine Sodium, Ezetimibe. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Harry Gruenspan, MD accept Medicare? ▼
Harry Gruenspan, MD appears in CMS Medicare data with 1,629 Part D claims and 139 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Harry Gruenspan, MD's credentials? ▼
Harry Gruenspan, MD's NPI is 1649349010 with credentials MD. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.