NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1366481509 M.D.
Verify on CMS → Erin Hsu, M.D.
Infectious Disease 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 8,314 in Infectious Disease 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
97
Medicare Part D claims · 31 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
97.2/100
▲ 14 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
Erin Hsu, M.D. reported a CMS MIPS final score of 97.2/100 - above the 83.1 national average - and filed 97 Medicare Part D claims in 2023.
- 97.2/100
- MIPS score · +14 vs avg
- 97
- Part D claims, 2023
- 84%
- 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.
Erin Hsu, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
97 Top 15% higher than 85% 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 Erin Hsu, M.D. sits
This provider among infectious disease physician peers
Across the 2,276 infectious disease physician providers who report both Medicare Part D prescribing and a MIPS quality score, Erin Hsu, M.D. writes more Part D claims than 16% of them and scores higher on MIPS quality than 84% - 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 infectious disease physician peer from a representative sample of 60; the gold marker is Erin Hsu, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Erin Hsu, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Erin Hsu, M.D.?
High performer (top quartile)Primary specialty
Infectious Disease Physician
Medicare Part D claims
97 88% vs specialty avg
MIPS final score
97.2/100 14.1 pts vs avg
Specialty distribution in California
How Infectious Disease Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Erin Hsu, M.D.'s 2023 MIPS final score plotted against the Infectious Disease Physician national average
- MIPS Final Score
- 97.2/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Infectious Disease Physician) - 97.2/100 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).
Erin Hsu, M.D. appears in the CMS NPPES registry as an Infectious Disease Physician provider holding M.D. credentials at 2100 WEBSTER STREET, San Francisco, CA, 94115, with a listed phone of (415) 923-3883. NPI 1366481509 was issued on 06/05/2006.
Medicare Part D records for calendar year 2023 show 97 prescription claims written by this provider, covering 31 Medicare beneficiaries and totaling roughly $89K in drug spend, split 16% brand-name and 84% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 97.2/100 for the 2023 performance year (Quality 88.3, Cost 69.5), compared with the national average of 83.1.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,314 enrolled providers across 54 states and an average of 816 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 | 1366481509 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 06/05/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
97.2245
Final Score
Avg: 83.1
88.3333
Quality
69.5333
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Erin Hsu, 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.
Pacific Inpatient Medical Group
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).
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 Erin Hsu, M.D.. To verify Erin Hsu, 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
Erin Hsu, M.D. - brand share 16.0%
Infectious Disease Physician average
16% brand-name claims vs 84% generic, on 97 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.
97
Total Claims
$89K
Total Drug Cost
31
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 111
- Total Day Supply
- 1,890
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $80K
- Generic Drug Cost
- $9K
- Antibiotic Claims
- 60
Patient Demographics
- Average Patient Age
- 73.5 years
- Avg HCC Risk Score
- 2.50
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Erin Hsu, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ceftriaxone
Ceftriaxone
23 claims
- Fluconazole
Fluconazole
17 claims
- Ampicillin Sodium
Ampicillin Sodium
13 claims
| Drug | Claims |
|---|---|
| Ceftriaxone Ceftriaxone Sodium | 23 |
| Fluconazole | 17 |
| Ampicillin Sodium | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Erin Hsu, M.D. fits within the Infectious Disease Physician landscape nationally.
8,314
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Erin Hsu, M.D.'s 97 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Hsu.
Dr. Sanaz Abderrahmane
M.D.
Sacramento, CA
Dr. Glen Abergel
M.D.
Oxnard, CA
Dr. Igor Abolnik
MD
Rureka, CA
Dr. Nehkonti Adams
M.D.
San Diego, CA
Dr. Alina Adeel
M.D
La Jolla, CA
Compare Infectious Disease 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 California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Infectious Disease 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 Erin Hsu, M.D.'s specialty? ▼
Erin Hsu, M.D. specializes in Infectious Disease Physician and practices in San Francisco, California. Credentials: M.D..
How much does Erin Hsu, M.D. prescribe under Medicare Part D? ▼
In 2023, Erin Hsu, M.D. wrote 97 Medicare Part D claims totaling $89K in drug costs for 31 beneficiaries.
What is Erin Hsu, M.D.'s Medicare quality score? ▼
Erin Hsu, M.D. has a CMS MIPS Final Score of 97.2/100 (Quality: 88.3, Cost: 69.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Erin Hsu, M.D. located? ▼
Erin Hsu, M.D. is located at 2100 WEBSTER STREET, San Francisco, CA, 94115. Phone: (415) 923-3883.
What is Erin Hsu, M.D.'s NPI number? ▼
Erin Hsu, M.D.'s National Provider Identifier (NPI) is 1366481509, issued on 06/05/2006.
Does Erin Hsu, M.D. prescribe more brand-name or generic drugs? ▼
Erin Hsu, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $80K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,314 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Erin Hsu, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Erin Hsu, M.D.'s most frequently prescribed drugs include Ceftriaxone, Fluconazole, Ampicillin Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Erin Hsu, M.D. accept Medicare? ▼
Erin Hsu, M.D. appears in CMS Medicare data with 97 Part D claims and 31 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Erin Hsu, M.D.'s credentials? ▼
Erin Hsu, M.D.'s NPI is 1366481509 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.
- 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.
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.