Justin Tien, MD
NPI 1609370345 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Tien, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1609370345).
Provider details
- NPI number
- 1609370345
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A173600 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
313 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 126 | $88 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 96 | $132 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 33 | $130 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 29 | $145 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 29 | $193 |
Typical Medicare-allowed amounts for these services range $88–$193 (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.
Practice location
Mailing address
Additional practice locations (1)
- 1001 Potrero Avenue, #0862San Francisco, CA 94110Phone: (415) 514-9256
Registry dates
- Enumerated
- 2018-03-19
- Last updated
- 2025-09-19
- Certified
- 2025-09-19
Frequently asked questions
- What is Justin Tien's NPI number?
- Justin Tien's National Provider Identifier (NPI) is 1609370345, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Tien's specialty?
- Justin Tien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Tien located?
- Justin Tien's practice location on file with NPPES is 505 Parnassus Ave, San Francisco, CA 94143-2204.
- What is Justin Tien's phone number?
- The practice phone number listed in the NPPES registry for Justin Tien is (415) 476-1000.
- Does Justin Tien accept Medicare?
- Justin Tien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Tien's NPI active?
- Yes — Justin Tien's NPI (1609370345) is active in the NPPES registry as of the last update on 2025-09-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.