Anne Chen, M.D.
NPI 1003852708 · Internal Medicine Physician · Vacaville, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Anne Chen, M.D. is a Internal Medicine Physician provider in Vacaville, CA (NPI 1003852708).
Provider details
- NPI number
- 1003852708
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A83589 (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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
360 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 239 | $138 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 51 | $89 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 35 | $65 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 19 | $89 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 16 | $125 |
Typical Medicare-allowed amounts for these services range $65–$138 (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 · 133 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 444 | 119 |
| Atorvastatin Calcium | 443 | 135 |
| Lisinopril | 300 | 81 |
| Losartan Potassium | 253 | 75 |
| Metformin Hcl | 240 | 68 |
| Levothyroxine Sodium | 221 | 50 |
| Albuterol Sulfate |
Practice location
Mailing address
Additional practice locations (1)
- 1127 Texas StSuite aFairfield, CA 94533-5745Phone: (707) 426-6060
Registry dates
- Enumerated
- 2006-06-21
- Last updated
- 2025-09-30
- Certified
- 2025-09-30
Frequently asked questions
- What is Anne Chen's NPI number?
- Anne Chen's National Provider Identifier (NPI) is 1003852708, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Anne Chen's specialty?
- Anne Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Anne Chen located?
- Anne Chen's practice location on file with NPPES is 770 Mason St, Vacaville, CA 95688-4646.
- What is Anne Chen's phone number?
- The practice phone number listed in the NPPES registry for Anne Chen is (707) 427-4900.
- Does Anne Chen accept Medicare?
- Anne Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Anne Chen's NPI active?
- Yes — Anne Chen's NPI (1003852708) is active in the NPPES registry as of the last update on 2025-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.