Caroline Pieszak, M.D.
NPI 1558415257 · Family Medicine Physician · Westlake Village, CA
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Caroline Pieszak, M.D. is a Family Medicine Physician provider in Westlake Village, CA (NPI 1558415257).
Provider details
- NPI number
- 1558415257
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A64453 (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
19 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 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 44 | — |
| Sitagliptin Phosphatebrand: Januvia | 38 | — |
| Azithromycin | 36 | 17 |
| Apixabanbrand: Eliquis | 31 | — |
| Omeprazole | 27 | — |
| Alprazolam | 24 | — |
| Lisinopril | 22 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-22
- Last updated
- 2017-02-09
Frequently asked questions
- What is Caroline Pieszak's NPI number?
- Caroline Pieszak's National Provider Identifier (NPI) is 1558415257, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Caroline Pieszak's specialty?
- Caroline Pieszak is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Caroline Pieszak located?
- Caroline Pieszak's practice location on file with NPPES is 1220 La Venta Dr, Westlake Village, CA 91361-3703.
- What is Caroline Pieszak's phone number?
- The practice phone number listed in the NPPES registry for Caroline Pieszak is (805) 777-7242.
- Does Caroline Pieszak accept Medicare?
- Caroline Pieszak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Caroline Pieszak's NPI active?
- Yes — Caroline Pieszak's NPI (1558415257) is active in the NPPES registry as of the last update on 2017-02-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.