NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1649633991 M.D.
Verify on CMS → Waseem Ahmad, M.D.
Gastroenterology Physician in San Francisco, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,601 in Gastroenterology 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
295
Medicare Part D claims · 139 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Waseem Ahmad, M.D. filed 295 Medicare Part D claims in 2023 as a Gastroenterology Physician in San Francisco, California, prescribing 84% generic.
- 295
- Part D claims, 2023
- 84%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥49th
- 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 Waseem Ahmad, M.D.
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 1649633991), first enumerated 04/04/2016.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 295 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
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Waseem Ahmad, M.D.'s individual license status. Verify directly with the state medical board.
Source: MBC 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 1649633991 · Gastroenterology Physician
NPI-10 · ENUM-MID · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1649633991
- ENUM-MID 2016
- TAX-MID 17K Gastroenterology Physician
- RX-LIGHT 295
- BOOK-LIGHT 1,717 in California
- PHOTO-ENUM Oviea Akpotaire · 2016
Waseem Ahmad, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
295 ≥ 49th percentile 49% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Waseem Ahmad, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Waseem Ahmad, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
295 65% vs specialty avg
Specialty distribution in California
How Gastroenterology Physician compares to other specialties among California 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 Gastroenterology 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 | 1649633991 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/04/2016 |
Hospital and facility affiliations
Facilities where Waseem Ahmad, 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.
Regents OF The University OF California
San Francisco, CA
Ucsf Medical Group Business Services
Burlingame, CA
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 - California MBC 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 ~150K California medical licensees in 2023 - they are NOT specific to Waseem Ahmad, M.D.. To verify Waseem Ahmad, M.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC 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 California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Waseem Ahmad, M.D. - brand share 16.0%
Gastroenterology Physician average
16% brand-name claims vs 84% generic, on 295 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.
295
Total Claims
$172K
Total Drug Cost
139
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 398
- Total Day Supply
- 8,028
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $159K
- Generic Drug Cost
- $13K
- Antibiotic Claims
- 26
Patient Demographics
- Average Patient Age
- 69.9 years
- Avg HCC Risk Score
- 1.39
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Waseem Ahmad, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Hcl
Ondansetron Hcl
45 claims
- Omeprazole
Omeprazole
35 claims
- Famotidine
Famotidine
22 claims
- Xifaxan 14
Xifaxan
14 claims
- Linzess 13
Linzess
13 claims
- Lansoprazole 11
Lansoprazole
11 claims
| Drug | Claims |
|---|---|
| Ondansetron Hcl | 45 |
| Omeprazole | 35 |
| Famotidine | 22 |
| Xifaxan Rifaximin | 14 |
| Linzess Linaclotide | 13 |
| Lansoprazole | 11 |
| Gavilyte-G "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Waseem Ahmad, M.D. fits within the Gastroenterology Physician landscape nationally.
16,601
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Waseem Ahmad, M.D.'s 295 claims are below the specialty average of 833.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Ahmad, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2016)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Ahmad.
One of 1,717 Gastroenterology Physician providers enrolled in California, 5 are shown here.
Dr. David Aarons
MD
Lodi, CA
Dr. Constante Abaya
MD
Oxnard, CA
Dr. Homan Abdollahzadeh
MD
Palm Springs, CA
Dr. John Abdulian
M.D.
Fresno, CA
Dr. Hussein Abidali
DO
Rancho Cucamonga, CA
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Waseem Ahmad, M.D.'s specialty? ▼
Waseem Ahmad, M.D. specializes in Gastroenterology Physician and practices in San Francisco, California. Credentials: M.D..
How much does Waseem Ahmad, M.D. prescribe under Medicare Part D? ▼
In 2023, Waseem Ahmad, M.D. wrote 295 Medicare Part D claims totaling $172K in drug costs for 139 beneficiaries.
Where is Waseem Ahmad, M.D. located? ▼
Waseem Ahmad, M.D. is located at 1701 DIVISADERO ST RM 120, San Francisco, CA, 94115. Phone: (415) 502-4444.
What is Waseem Ahmad, M.D.'s NPI number? ▼
Waseem Ahmad, M.D.'s National Provider Identifier (NPI) is 1649633991, issued on 04/04/2016.
Does Waseem Ahmad, M.D. prescribe more brand-name or generic drugs? ▼
Waseem Ahmad, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $159K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,601 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Waseem Ahmad, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Waseem Ahmad, M.D.'s most frequently prescribed drugs include Ondansetron Hcl, Omeprazole, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Waseem Ahmad, M.D. accept Medicare? ▼
Waseem Ahmad, M.D. appears in CMS Medicare data with 295 Part D claims and 139 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Waseem Ahmad, M.D.'s credentials? ▼
Waseem Ahmad, M.D.'s NPI is 1649633991 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.