Terence Gan, MD MPH
NPI 1104087808 · Internal Medicine Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Terence Gan, MD MPH is a Internal Medicine Physician provider in San Diego, CA (NPI 1104087808).
Provider details
- NPI number
- 1104087808
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD MPH
- Sex
- Male
- Sole proprietor
- Yes
- License
- A106013 (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
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
747 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 50 Minutes99233 | 508 | $112 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 144 | $109 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 61 | $74 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 18 | $162 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 16 | $47 |
Typical Medicare-allowed amounts for these services range $47–$162 (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 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 37 | 16 |
| Pantoprazole Sodium | 36 | 19 |
| Apixabanbrand: Eliquis | 31 | 12 |
| Losartan Potassium | 26 | — |
| Levothyroxine Sodium | 25 | — |
| Tamsulosin Hcl | 23 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-06-24
- Last updated
- 2015-09-10
Frequently asked questions
- What is Terence Gan's NPI number?
- Terence Gan's National Provider Identifier (NPI) is 1104087808, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Terence Gan's specialty?
- Terence Gan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Terence Gan located?
- Terence Gan's practice location on file with NPPES is 808 4th Ave Apt 313, San Diego, CA 92101-6142.
- What is Terence Gan's phone number?
- The practice phone number listed in the NPPES registry for Terence Gan is (626) 485-8622.
- Does Terence Gan accept Medicare?
- Terence Gan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Terence Gan's NPI active?
- Yes — Terence Gan's NPI (1104087808) is active in the NPPES registry as of the last update on 2015-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.