Annapoorani Chellappan, M.D.
NPI 1023377330 · Family Medicine Physician · Thousand Oaks, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Annapoorani Chellappan, M.D. is a Family Medicine Physician provider in Thousand Oaks, CA (NPI 1023377330).
Provider details
- NPI number
- 1023377330
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A136580 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 80 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 453 | 161 |
| Levothyroxine Sodium | 259 | 89 |
| Losartan Potassium | 257 | 87 |
| Lisinopril | 252 | 87 |
| Amlodipine Besylate | 238 | 95 |
| Rosuvastatin Calcium | 230 | 77 |
| Atenolol |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-05-07
- Last updated
- 2021-11-29
Frequently asked questions
- What is Annapoorani Chellappan's NPI number?
- Annapoorani Chellappan's National Provider Identifier (NPI) is 1023377330, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Annapoorani Chellappan's specialty?
- Annapoorani Chellappan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Annapoorani Chellappan located?
- Annapoorani Chellappan's practice location on file with NPPES is 365 E Hillcrest Dr, Thousand Oaks, CA 91360-5820.
- What is Annapoorani Chellappan's phone number?
- The practice phone number listed in the NPPES registry for Annapoorani Chellappan is (888) 515-3500.
- Does Annapoorani Chellappan accept Medicare?
- Annapoorani Chellappan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Annapoorani Chellappan's NPI active?
- Yes — Annapoorani Chellappan's NPI (1023377330) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.