NPI registry status
Active
2026 NPPES data Urology Physician NPI 1063755148 M.D.
Verify on CMS → Justin Ahn, M.D.
Urology 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 13,606 in Urology 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
418
Medicare Part D claims · 132 beneficiaries · Urology Physician avg: 1K
MIPS score
75/100
CMS neutral threshold · no category scores published
Industry payments
$772.39
10 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Justin Ahn, M.D. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 418 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 418
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥61st
- 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 Justin Ahn, 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 1063755148), first enumerated 03/27/2013.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 418 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- 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
- Reported
Industry payment transparency
$772.39 in reported industry payments (10 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Justin Ahn, 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 1063755148 · Urology Physician
NPI-10 · ENUM-MID · TAX-MID · MIPS-NEUTRAL · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1063755148
- ENUM-MID 2013
- TAX-MID 14K Urology Physician
- MIPS-NEUTRAL 75/100
- RX-LIGHT 418
- BOOK-LIGHT 1,421 in California
- PHOTO-ENUM Patrick Guthrie · 2013
Justin Ahn, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
418 ≥ 61st percentile 61% 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)
Justin Ahn, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Justin Ahn, M.D.?
CMS neutral score, not measuredPrimary specialty
Urology Physician
Medicare Part D claims
418 69% vs specialty avg
MIPS final score
75/100
Specialty distribution in California
How Urology Physician compares to other specialties among California providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
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 | 1063755148 |
|---|---|
| Specialty | Urology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/27/2013 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Group practice
Hospital and facility affiliations
Facilities where Justin Ahn, 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.
Ucsf Medical Group Business Services
San Francisco, CA
University OF California San Francisco
San Francisco, 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).
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 Justin Ahn, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$772
Largest payer
Boston Scientific 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 - 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 Justin Ahn, M.D.. To verify Justin Ahn, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
418
Total Claims
$41K
Total Drug Cost
132
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 731.433
- Total Day Supply
- 20,189
- Generic Drug Cost
- $12K
- Antibiotic Claims
- 63
Patient Demographics
- Average Patient Age
- 73.6 years
- Avg HCC Risk Score
- 1.36
- Gender Split
- 20% female / 80% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Justin Ahn, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Tamsulosin Hcl
Tamsulosin Hcl
68 claims
- Finasteride
Finasteride
37 claims
- Myrbetriq
Myrbetriq
36 claims
- Potassium Citrate Er
Potassium Citrate Er
33 claims
- Alfuzosin Hcl Er 25
Alfuzosin Hcl Er
25 claims
- Nitrofurantoin Mon… 22
Nitrofurantoin Mono-Macro
22 claims
- Silodosin 20
Silodosin
20 claims
- Estradiol 19
Estradiol
19 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 68 |
| Finasteride | 37 |
| Myrbetriq Mirabegron | 36 |
| Potassium Citrate Er Potassium Citrate | 33 |
| Alfuzosin Hcl Er Alfuzosin Hcl | 25 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 22 |
| Silodosin | 20 |
| Estradiol | 19 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 14 |
| Methenamine Hippurate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Urology Physician Overview
How Justin Ahn, M.D. fits within the Urology Physician landscape nationally.
13,606
Urology Physician Providers in US
54
States with Urology Physician
1,354
Avg Claims per Provider
Justin Ahn, M.D.'s 418 claims are below the specialty average of 1,354.
Nationwide Urology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Ahn, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2013)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Urology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Ahn.
One of 1,421 Urology Physician providers enrolled in California, 5 are shown here.
Dr. David Aaronson
MD
Oakland, CA
Dr. Jason Abber
MD
Panorama City, CA
Dr. Marc Abboud
MD
Los Alamitos, CA
George Abdelsayed
Anaheim, CA
Garen Abedi
Downey, CA
Compare Urology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Justin Ahn, M.D.'s specialty? ▼
Justin Ahn, M.D. specializes in Urology Physician and practices in San Francisco, California. Credentials: M.D..
How much does Justin Ahn, M.D. prescribe under Medicare Part D? ▼
In 2024, Justin Ahn, M.D. wrote 418 Medicare Part D claims totaling $41K in drug costs for 132 beneficiaries.
What is Justin Ahn, M.D.'s Medicare quality score? ▼
Justin Ahn, M.D. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Justin Ahn, M.D. located? ▼
Justin Ahn, M.D. is located at 400 PARNASSUS AVE, San Francisco, CA, 94143. Phone: (415) 885-7748.
What is Justin Ahn, M.D.'s NPI number? ▼
Justin Ahn, M.D.'s National Provider Identifier (NPI) is 1063755148, issued on 03/27/2013.
How many Urology Physician providers are there in the US? ▼
There are 13,606 Urology Physician providers across 54 states in the US. The average Urology Physician provider writes 1,354 Medicare Part D claims per year.
What drugs does Justin Ahn, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Justin Ahn, M.D.'s most frequently prescribed drugs include Tamsulosin Hcl, Finasteride, Myrbetriq. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Justin Ahn, M.D. accept Medicare? ▼
Justin Ahn, M.D. appears in CMS Medicare data with 418 Part D claims and 132 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Justin Ahn, M.D.'s credentials? ▼
Justin Ahn, M.D.'s NPI is 1063755148 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 (2024). 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 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.