Ann Duncan, M.D.
NPI 1639513823 · Family Medicine Physician · Folsom, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ann Duncan, M.D. is a Family Medicine Physician provider in Folsom, CA (NPI 1639513823).
Provider details
- NPI number
- 1639513823
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A135992 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 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
366 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 | 169 | $134 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 50 | $137 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 48 | $189 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 37 | $96 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 33 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 149 | 44 |
| Levothyroxine Sodium | 92 | 24 |
| Losartan Potassium | 78 | 24 |
| Gabapentin | 60 | 20 |
| Amlodipine Besylate | 54 | 19 |
| Omeprazole | 53 | 15 |
| Lisinopril |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-04-18
- Last updated
- 2016-09-14
Frequently asked questions
- What is Ann Duncan's NPI number?
- Ann Duncan's National Provider Identifier (NPI) is 1639513823, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Duncan's specialty?
- Ann Duncan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ann Duncan located?
- Ann Duncan's practice location on file with NPPES is 2575 East Bidwell St, Folsom, CA 95630.
- What is Ann Duncan's phone number?
- The practice phone number listed in the NPPES registry for Ann Duncan is (916) 817-3700.
- Does Ann Duncan accept Medicare?
- Ann Duncan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ann Duncan's NPI active?
- Yes — Ann Duncan's NPI (1639513823) is active in the NPPES registry as of the last update on 2016-09-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.