Provider Profile
Diane M. Castignani, FNP
Unclaimed ProfileAbout Diane Castignani
Listed in the NPI registry as a nurse practitioner, Diane M. Castignani, FNP practices in San Jose, CA. Medicare claims data shows Diane provided 562 services to 538 patients. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, new patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more, and automated urinalysis test.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (408) 984-7226
- Email not available
Practice Locations
798 S WINCHESTER BLVD
San Jose, CA 95128
15400 Los Gatos Blvd
Los Gatos, CA 95032
751 S Bascom Ave
San Jose, CA 95128
Procedures Most Often Billed to Medicare
562 services · 538 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of impacted ear wax by washing | Procedure | 69209 |
14 | As often as other peers in Nurse Practitioner |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
243 | More often than most peers in Nurse Practitioner |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
119 | More than most peers in Nurse Practitioner |
| Automated urinalysis test | Lab test | 81003 |
53 | More often than most peers in Nurse Practitioner |
| Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza | Lab test | 87428 |
28 | More often than most peers in Nurse Practitioner |
| Telephone medical discussion with physician, 11-20 minutes | Office visit | 99442 |
23 | As often as other peers in Nurse Practitioner |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
16 | Less often than most peers in Nurse Practitioner |
| Detection test by immunoassay with direct visual observation for streptococcus, group a (strep) | Lab test | 87880 |
16 | As often as other peers in Nurse Practitioner |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
15 | Less often than most peers in Nurse Practitioner |
| Telephone medical discussion with physician, 5-10 minutes | Office visit | 99441 |
12 | Less often than most peers in Nurse Practitioner |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other nurse practitioners at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other nurse practitioners in San Jose 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2016 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of impacted ear wax by washing 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Diane M. Castignani's specialty?
Diane M. Castignani is a nurse practitioner in San Jose, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Diane M. Castignani?
Diane M. Castignani is listed at 798 S Winchester Blvd, San Jose, CA 95128. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Diane M. Castignani?
The number on file is (408) 984-7226. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Diane M. Castignani?
Diane M. Castignani's National Provider Identifier is 1881132801. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Diane M. Castignani's education?
Diane M. Castignani attended Other, graduating in 2016. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Diane M. Castignani have?
Diane M. Castignani has 10 years experience. Calculated from a graduation year of 2016, reported in the CMS National Downloadable File.
CMS public data
What is Diane M. Castignani known for?
According to Medicare billing data, Diane M. Castignani performs procedures including removal of impacted ear wax by washing, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Diane M. Castignani's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Diane M. Castignani. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.