Diane Castignani, FNP
NPI 1881132801 · Nurse Practitioner · San Jose, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Castignani, FNP is a Nurse Practitioner provider in San Jose, CA (NPI 1881132801).
Provider details
- NPI number
- 1881132801
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 95005831 (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 tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
562 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 243 | $94 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 119 | $114 |
| Automated Urinalysis Test81003 | 53 | $2 |
| Detection Test By Immunoassay Technique for Severe Acute Respiratory Syndrome Coronavirus and Influenza87428 | 28 | $69 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 23 | $94 |
| Detection Test By Immunoassay With Direct Visual Observation for Streptococcus, Group a (strep)87880 | 16 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 39 | 39 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 32 | 32 |
| Azithromycin | 26 | 26 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 22 | 22 |
| Cephalexin | 21 | 20 |
| Doxycycline Hyclate | 18 | 17 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro |
Practice location
Mailing address
Additional practice locations (2)
- 15400 Los Gatos BlvdLos Gatos, CA 95032-2502Phone: (408) 730-6200
- 751 S Bascom AveSan Jose, CA 95128-2604Phone: (408) 885-5000
Registry dates
- Enumerated
- 2017-02-09
- Last updated
- 2022-07-11
- Certified
- 2022-07-11
Frequently asked questions
- What is Diane Castignani's NPI number?
- Diane Castignani's National Provider Identifier (NPI) is 1881132801, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Castignani's specialty?
- Diane Castignani is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Diane Castignani located?
- Diane Castignani's practice location on file with NPPES is 798 S Winchester Blvd, San Jose, CA 95128-2928.
- What is Diane Castignani's phone number?
- The practice phone number listed in the NPPES registry for Diane Castignani is (408) 984-7226.
- Does Diane Castignani accept Medicare?
- Diane Castignani is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Castignani's NPI active?
- Yes — Diane Castignani's NPI (1881132801) is active in the NPPES registry as of the last update on 2022-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.