Nancy Chiao-Castle
NPI 1578619052 · Nurse Practitioner · San Mateo, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nancy Chiao-Castle is a Nurse Practitioner provider in San Mateo, CA (NPI 1578619052).
Provider details
- NPI number
- 1578619052
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
- License
- RN245686 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 51 | 27 |
| Atorvastatin Calcium | 43 | 22 |
| Diclofenac Sodium | 40 | 24 |
| Losartan Potassium | 33 | 13 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 28 | — |
| Metformin Hcl | 19 | 12 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Nancy Chiao-Castle's NPI number?
- Nancy Chiao-Castle's National Provider Identifier (NPI) is 1578619052, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Chiao-Castle's specialty?
- Nancy Chiao-Castle is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Nancy Chiao-Castle located?
- Nancy Chiao-Castle's practice location on file with NPPES is 222 W 39th Ave, San Mateo, CA 94403-4364.
- What is Nancy Chiao-Castle's phone number?
- The practice phone number listed in the NPPES registry for Nancy Chiao-Castle is (650) 573-2222.
- Does Nancy Chiao-Castle accept Medicare?
- Nancy Chiao-Castle is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nancy Chiao-Castle's NPI active?
- Yes — Nancy Chiao-Castle's NPI (1578619052) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.