Lan Zhang, MD
NPI 1871671610 · Internal Medicine Physician · Stockton, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lan Zhang, MD is a Internal Medicine Physician provider in Stockton, CA (NPI 1871671610).
Provider details
- NPI number
- 1871671610
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A81856 (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
19 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
11 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) |
|---|---|---|
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 11 | $110 |
Typical Medicare-allowed amounts for these services range $110–$110 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 49 | 20 |
| Atorvastatin Calcium | 41 | 17 |
| Losartan Potassium | 23 | — |
| Gabapentin | 18 | — |
| Cyclobenzaprine Hcl | 16 | — |
| Omeprazole | 16 | — |
| Trazodone Hcl | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2015-12-16
Frequently asked questions
- What is Lan Zhang's NPI number?
- Lan Zhang's National Provider Identifier (NPI) is 1871671610, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lan Zhang's specialty?
- Lan Zhang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lan Zhang located?
- Lan Zhang's practice location on file with NPPES is 2505 W Hammer Ln, Stockton, CA 95209-2839.
- What is Lan Zhang's phone number?
- The practice phone number listed in the NPPES registry for Lan Zhang is (209) 957-7050.
- Does Lan Zhang accept Medicare?
- Lan Zhang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lan Zhang's NPI active?
- Yes — Lan Zhang's NPI (1871671610) is active in the NPPES registry as of the last update on 2015-12-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.