Ryan Chang, MD
NPI 1831277417 · Critical Care Medicine (Internal Medicine) Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Chang, MD is a Critical Care Medicine (Internal Medicine) Physician provider in San Francisco, CA (NPI 1831277417).
Provider details
- NPI number
- 1831277417
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A63692 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 30 | 12 |
| Tiotropium Br/Olodaterol Hclbrand: Stiolto Respimat | 23 | — |
| Ciclesonidebrand: Alvesco | 22 | — |
| Azithromycin | 15 | — |
| Prednisone | 15 | 12 |
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 15 | — |
| Fluticasone Propionate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-13
Frequently asked questions
- What is Ryan Chang's NPI number?
- Ryan Chang's National Provider Identifier (NPI) is 1831277417, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Chang's specialty?
- Ryan Chang is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Chang located?
- Ryan Chang's practice location on file with NPPES is 2200 Ofarrell St, San Francisco, CA 94115-3357.
- What is Ryan Chang's phone number?
- The practice phone number listed in the NPPES registry for Ryan Chang is (415) 833-2000.
- Does Ryan Chang accept Medicare?
- Ryan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Chang's NPI active?
- Yes — Ryan Chang's NPI (1831277417) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.