NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1245320951 MD
Verify on CMS → Harold Keiser, MD
Rheumatology Physician in Bronx, 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 6,181 in Rheumatology 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
1K
Medicare Part D claims · 130 beneficiaries · Rheumatology Physician avg: 2K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
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
Harold Keiser, MD reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 1,152 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 1K
- Part D claims, 2023
- 87%
- 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.
Harold Keiser, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Harold Keiser, MD sits
This provider among rheumatology physician peers
Across the 2,181 rheumatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Harold Keiser, MD writes more Part D claims than 29% of them and scores higher on MIPS quality than 94% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one rheumatology physician peer from a representative sample of 60; the gold marker is Harold Keiser, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Harold Keiser, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Harold Keiser, MD?
High performer (top quartile)Primary specialty
Rheumatology Physician
Medicare Part D claims
1,152 44% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in New York
How Rheumatology Physician compares to other specialties among New York providers
Medicare quality performance, MIPS
Harold Keiser, MD's 2023 MIPS final score plotted against the Rheumatology Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Rheumatology Physician) - 100/100 vs national avg 83.1
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).
Harold Keiser, MD appears in the CMS NPPES registry as a Rheumatology Physician provider holding MD credentials at MONTEFIORE MEDICAL PARK, Bronx, NY, 10461, with a listed phone of (718) 405-8323. NPI 1245320951 was issued on 10/13/2006.
Medicare Part D records for calendar year 2023 show 1,152 prescription claims written by this provider, covering 130 Medicare beneficiaries and totaling roughly $1.3 million in drug spend, split 13% brand-name and 87% generic by claim count, with an opioid prescribing rate of 13.4%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year, compared with the national average of 83.1.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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 | 1245320951 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/13/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
100
Promoting Interoperability
Reporting: Group practice
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 Harold Keiser, MD. To verify Harold Keiser, 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
Harold Keiser, MD - brand share 13.0%
Rheumatology Physician average
13% brand-name claims vs 87% generic, on 1,152 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.
1,152
Total Claims
$1.3M
Total Drug Cost
130
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,798
- Total Day Supply
- 52,238
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $1.2M
- Generic Drug Cost
- $36K
- Opioid Claims
- 154 (13.4% rate)
Patient Demographics
- Average Patient Age
- 69.2 years
- Avg HCC Risk Score
- 1.46
- Gender Split
- 81% female / 19% male
- Age Distribution
- <65: 34, 65-74: 61, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Harold Keiser, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
122 claims
- Methotrexate
Methotrexate
100 claims
- Gabapentin
Gabapentin
82 claims
- Cyclobenzaprine Hcl
Cyclobenzaprine Hcl
80 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
62 claims
- Enbrel Sureclick
Enbrel Sureclick
50 claims
- Leflunomide 40
Leflunomide
40 claims
- Zolpidem Tartrate 39
Zolpidem Tartrate
39 claims
| Drug | Claims |
|---|---|
| Prednisone | 122 |
| Methotrexate Methotrexate Sodium | 100 |
| Gabapentin | 82 |
| Cyclobenzaprine Hcl | 80 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 62 |
| Enbrel Sureclick Etanercept | 50 |
| Leflunomide | 40 |
| Zolpidem Tartrate | 39 |
| Allopurinol | 35 |
| Pregabalin | 34 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Harold Keiser, MD fits within the Rheumatology Physician landscape nationally.
6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Harold Keiser, MD's 1,152 claims are below the specialty average of 2,054.
Nearby Rheumatology Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Keiser.
Dr. Mary Abdulky
MD
Syracuse, NY
Dr. Ilana Abeles
M.D., PHD
Rochester, NY
Dr. Jihad Abialmouna
M.D.
West Amherst, NY
Dr. Omar Abialmouna
MD
Buffalo, NY
Dr. Irina Abramova
D.O
New Hyde Park, NY
Compare Rheumatology 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 New York medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Rheumatology 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.
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Frequently Asked Questions
What is Harold Keiser, MD's specialty? ▼
Harold Keiser, MD specializes in Rheumatology Physician and practices in Bronx, New York. Credentials: MD.
How much does Harold Keiser, MD prescribe under Medicare Part D? ▼
In 2023, Harold Keiser, MD wrote 1,152 Medicare Part D claims totaling $1.3M in drug costs for 130 beneficiaries.
What is Harold Keiser, MD's Medicare quality score? ▼
Harold Keiser, MD has a CMS MIPS Final Score of 100/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Harold Keiser, MD located? ▼
Harold Keiser, MD is located at MONTEFIORE MEDICAL PARK, Bronx, NY, 10461. Phone: (718) 405-8323.
What is Harold Keiser, MD's NPI number? ▼
Harold Keiser, MD's National Provider Identifier (NPI) is 1245320951, issued on 10/13/2006.
Does Harold Keiser, MD prescribe more brand-name or generic drugs? ▼
Harold Keiser, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $1.2M in brand drug costs.
Does Harold Keiser, MD prescribe opioids? ▼
Yes, Harold Keiser, MD had 154 opioid claims in 2023 with an opioid prescribing rate of 13.4%.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Harold Keiser, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Harold Keiser, MD's most frequently prescribed drugs include Prednisone, Methotrexate, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Harold Keiser, MD accept Medicare? ▼
Harold Keiser, MD appears in CMS Medicare data with 1,152 Part D claims and 130 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Harold Keiser, MD's credentials? ▼
Harold Keiser, MD's NPI is 1245320951 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.