NPI registry status
Active
2026 NPPES data Endocrinology, Diabetes & Metabolism Physician NPI 1891746129 MD
Verify on CMS → Cheng-Yang Tuan, MD
Endocrinology, Diabetes & Metabolism 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 7,871 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
11K
Medicare Part D claims · 994 beneficiaries · Endocrinology, Diabetes & Metabolism Physician avg: 3K
Generic prescribing
47%
generic claims · 49% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
23/100
▼ 61 pts below national avg 83.5 · Below average
Industry payments
$81.0K
304 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Cheng-Yang Tuan, MD reported a CMS MIPS final score of 23/100 - below the 83.5 national average - and filed 11,275 Medicare Part D claims in 2023.
- 23/100
- MIPS score · -61 vs avg
- 11K
- Part D claims, 2023
- 47%
- 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.
Federal trust snapshot
What official records show about Cheng-Yang Tuan, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1891746129), first enumerated 05/12/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 11,275 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)
Reported a CMS MIPS final score of 23/100 in the Quality Payment Program — a federal quality measure, not a patient review.
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
Industry payment transparency
$81.0K in reported industry payments (304 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 Cheng-Yang Tuan, MD'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 1891746129 · Endocrinology, Diabetes & Metabolism Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-LOW · RX-HEAVY · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1891746129
- ENUM-LEGACY 2006
- TAX-MID 8K Endocrinology, Diabetes
- MIPS-LOW 23/100
- RX-HEAVY 11K claims
- BOOK-LIGHT 879 in California
- PHOTO-FINISH Shahed Quyyumi · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Ralph Teague · l…
Ralph Teague
22.7 MIPS pts
- Tuan · this prov…
Tuan · this provider
23 MIPS pts
- Shahed Quyyumi ·…
Shahed Quyyumi
23 MIPS pts
- Leon Shulman · n…
Leon Shulman
23 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Cheng-Yang Tuan, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
23 ≥ 3rd percentile 3% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Cheng-Yang Tuan, MD sits
This provider among endocrinology, diabetes & metabolism physician peers
Across the 2,341 endocrinology, diabetes & metabolism physician providers who report both Medicare Part D prescribing and a MIPS quality score, Cheng-Yang Tuan, MD writes more Part D claims than 98% of them and scores higher on MIPS quality than 4% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one endocrinology, diabetes & metabolism physician peer from a representative sample of 60; the gold marker is Cheng-Yang Tuan, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Cheng-Yang Tuan, 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 Cheng-Yang Tuan, MD?
Below national averagePrimary specialty
Endocrinology, Diabetes & Metabolism Physician
Medicare Part D claims
11,275 327% vs specialty avg
MIPS final score
23/100 60.5 pts vs avg
Specialty distribution in California
How Endocrinology, Diabetes & Metabolism Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Cheng-Yang Tuan, MD's 2023 MIPS final score plotted against the Endocrinology, Diabetes & Metabolism Physician national average
- MIPS Final Score
- 23/100
- vs 83.5 national avg · 2023 performance year
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 | 1891746129 |
|---|---|
| Specialty | Endocrinology, Diabetes & Metabolism Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/12/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
22.9579
Final Score
Measured-score avg: 83.5
0
Quality
76.5263
Cost
Reporting: Individual
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 Cheng-Yang Tuan, MD. Source: openpaymentsdata.cms.gov.
Total received
$81.0K
Largest payer
Lilly USA, LLC
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 Cheng-Yang Tuan, MD. To verify Cheng-Yang Tuan, MD'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 · Above average
Cheng-Yang Tuan, MD - brand share 49.0%
Endocrinology, Diabetes & Metabolism Physician average
49% brand-name claims vs 47% generic, on 11,275 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.
11,275
Total Claims
$7.0M
Total Drug Cost
994
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 27,548
- Total Day Supply
- 822,399
- Brand vs Generic
- 49% brand / 47% generic
- Brand Drug Cost
- $6.7M
- Generic Drug Cost
- $165K
Patient Demographics
- Average Patient Age
- 75.0 years
- Avg HCC Risk Score
- 1.59
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 49, 65-74: 452, 75-84: 369, 85+: 124
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Cheng-Yang Tuan, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Jardiance
Jardiance
1,115 claims
- Metformin Hcl Er
Metformin Hcl Er
893 claims
- Ozempic
Ozempic
832 claims
- Levothyroxine Sodium
Levothyroxine Sodium
731 claims
- Atorvastatin Calcium
Atorvastatin Calcium
669 claims
- Metformin Hcl 433
Metformin Hcl
433 claims
- Farxiga 384
Farxiga
384 claims
- Trulicity 378
Trulicity
378 claims
| Drug | Claims |
|---|---|
| Jardiance Empagliflozin | 1,115 |
| Metformin Hcl Er Metformin Hcl | 893 |
| Ozempic Semaglutide | 832 |
| Levothyroxine Sodium | 731 |
| Atorvastatin Calcium | 669 |
| Metformin Hcl | 433 |
| Farxiga Dapagliflozin Propanediol | 384 |
| Trulicity Dulaglutide | 378 |
| Pioglitazone Hcl | 354 |
| Amlodipine Besylate | 343 |
* 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 CA →
All providers in California →
Compare specialties →
Endocrinology, Diabetes & Metabolism Physician Overview
How Cheng-Yang Tuan, MD fits within the Endocrinology, Diabetes & Metabolism Physician landscape nationally.
7,871
Endocrinology, Diabetes & Metabolism Physician Providers in US
54
States with Endocrinology, Diabetes & Metabolism Physician
2,639
Avg Claims per Provider
Cheng-Yang Tuan, MD's 11,275 claims are above the specialty average of 2,639.
Nationwide Endocrinology, Diabetes & Metabolism Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Tuan, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (23 here).
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 California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Tuan.
One of 879 Endocrinology, Diabetes & Metabolism Physician providers enrolled in California, 5 are shown here.
Dr. Anita Abraham
M.D.
Stockton, CA
Dr. Sallie Adams
M.D.
Roseville, CA
Ananta Addala
Palo Alto, CA
Dr. Helen Adelberg
M.D.
Encino, CA
Dr. David Aftergood
MD
Beverly Hills, CA
Compare Endocrinology, Diabetes & Metabolism Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Cheng-Yang Tuan, MD's specialty? ▼
Cheng-Yang Tuan, MD specializes in Endocrinology, Diabetes & Metabolism Physician and practices in San Francisco, California. Credentials: MD.
How much does Cheng-Yang Tuan, MD prescribe under Medicare Part D? ▼
In 2023, Cheng-Yang Tuan, MD wrote 11,275 Medicare Part D claims totaling $7.0M in drug costs for 994 beneficiaries.
What is Cheng-Yang Tuan, MD's Medicare quality score? ▼
Cheng-Yang Tuan, MD has a CMS MIPS Final Score of 23/100 (Quality: 0, Cost: 76.5). 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 Cheng-Yang Tuan, MD located? ▼
Cheng-Yang Tuan, MD is located at 1580 VALENCIA ST, San Francisco, CA, 94110. Phone: (415) 695-7661.
What is Cheng-Yang Tuan, MD's NPI number? ▼
Cheng-Yang Tuan, MD's National Provider Identifier (NPI) is 1891746129, issued on 05/12/2006.
Does Cheng-Yang Tuan, MD prescribe more brand-name or generic drugs? ▼
Cheng-Yang Tuan, MD's prescribing is 49% brand-name and 47% generic drugs by claim count, with $6.7M in brand drug costs.
How many Endocrinology, Diabetes & Metabolism Physician providers are there in the US? ▼
There are 7,871 Endocrinology, Diabetes & Metabolism Physician providers across 54 states in the US. The average Endocrinology, Diabetes & Metabolism Physician provider writes 2,639 Medicare Part D claims per year.
What drugs does Cheng-Yang Tuan, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Cheng-Yang Tuan, MD's most frequently prescribed drugs include Jardiance, Metformin Hcl Er, Ozempic. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cheng-Yang Tuan, MD accept Medicare? ▼
Cheng-Yang Tuan, MD appears in CMS Medicare data with 11,275 Part D claims and 994 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cheng-Yang Tuan, MD's credentials? ▼
Cheng-Yang Tuan, MD's NPI is 1891746129 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
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.