Shawn Hassler, M.D.
NPI 1427122928 · Infectious Disease Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Shawn Hassler, M.D. is a Infectious Disease Physician provider in San Francisco, CA (NPI 1427122928).
Provider details
- NPI number
- 1427122928
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A062683 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
867 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 574 | $148 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 122 | $207 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 106 | $17 |
| Administration of Influenza Virus VaccineG0008 | 42 | $34 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 23 | $102 |
Typical Medicare-allowed amounts for these services range $17–$207 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 161 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 459 | 55 |
| Atorvastatin Calcium | 353 | 88 |
| Dolutegravir Sodiumbrand: Tivicay | 180 | 20 |
| Dolutegravir Sodium/Lamivudinebrand: Dovato | 175 | 22 |
| Valacyclovir Hclbrand: Valacyclovir | 175 | 42 |
| Acyclovir | 173 | 37 |
| Doravirinebrand: Pifeltro |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$64,957 across 211 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-17
- Last updated
- 2008-04-09
Frequently asked questions
- What is Shawn Hassler's NPI number?
- Shawn Hassler's National Provider Identifier (NPI) is 1427122928, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Shawn Hassler's specialty?
- Shawn Hassler is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Shawn Hassler located?
- Shawn Hassler's practice location on file with NPPES is 870 Market St, San Francisco, CA 94102-3002.
- What is Shawn Hassler's phone number?
- The practice phone number listed in the NPPES registry for Shawn Hassler is (415) 397-0700.
- Does Shawn Hassler accept Medicare?
- Shawn Hassler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Shawn Hassler's NPI active?
- Yes — Shawn Hassler's NPI (1427122928) is active in the NPPES registry as of the last update on 2008-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.