Katharine A. Castillo, NP
Family Nurse Practitioner · Tucson, AZ
Katharine A. Castillo, NP is a family nurse practitioner with a practice address in Tucson, Arizona, and NPI 1912435009, issued on Jun 1, 2017. Check the license (Arizona AP10184, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katharine A. Castillo
- Credential
- NP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- AP10184 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 551 W Magee RD, Tucson, AZ 85704
- Phone
- (520) 488-6467
- Enumerated
- Jun 1, 2017
- Record last updated
- Nov 25, 2025
- Medicaid ID
- 277684 AZ
- Medicare enrollment
- Enrolled (PECOS I20170818001522); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 5,933 in Arizona → Look up another NPI →
Also registered at 551 W Magee RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rosemarie Ampela, LCSWClinical Social Worker1124178264
- Barbara Caldwell, M.D.Family Medicine Physician1861475345
- Dana Denney, MA LPCProfessional Counselor1982933081
- Diana Gomez, FNPFamily Nurse Practitioner1912986068
- Bill Holloman, MDInternal Medicine Physician1356307771
- David Los, DOFamily Medicine Physician1598741720
Verify Katharine A. Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license AP10184Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.9 times the Medicare Part D claims of the average family nurse practitioner in 2024
7,722 Medicare Part D claims for 799 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Levothyroxine Sodium738 claims
- Atorvastatin Calcium640 claims
- Lisinopril396 claims
- Losartan Potassium335 claims
- Amlodipine Besylate289 claims
- Omeprazole239 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $56.51
2 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Tucson Physician Group Holdings LLCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katharine A. Castillo among 5,933 family nurse practitioner records in Arizona
Katharine A. Castillo, NP is one of 5,933 family nurse practitioner records with a practice address in Arizona. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 41% of them.
- NPI issued2017 · 41% of these records are older, 52% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2017 · median 2019 among the 3,510 with a school on file
- Record last updated2025 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
907 family nurse practitioner records list a practice address in Tucson
They are 907 of the 18,788 NPPES records with a practice address in Tucson, and 5,933 family nurse practitioner records in Arizona.
All 5,933 in Arizona → Every provider in Tucson → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Melisa Blachly, FNP-CTucson, AZ 857041396069126
- Mary Bradbury, ARNP FNPTucson, AZ 857041457340028
- Kathryn Clarke, FNPTucson, AZ 857041265665467
- Maryrose Deguzman, RN, FNP-CTucson, AZ 857041750556916
- Kimberly Dyer, F.N.P.Tucson, AZ 857041255690483
- Diana Gomez, FNPTucson, AZ 857041912986068
- Rachel Gordon, FNPCTucson, AZ 857041780714477
- Amanda Hernandez, FNP-CTucson, AZ 857041598023913
Common questions
What is Katharine A. Castillo, NP's NPI number?
Katharine A. Castillo, NP's National Provider Identifier (NPI) is 1912435009, issued on Jun 1, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Katharine A. Castillo, NP located?
The NPPES record lists a practice address at 551 W Magee RD, Tucson, AZ, 85704. Phone: (520) 488-6467. Providers update this record themselves, so call before visiting.
How can I verify Katharine A. Castillo, NP's license?
NPPES lists Arizona license number AP10184, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Katharine A. Castillo, NP prescribe under Medicare Part D?
In 2024, Katharine A. Castillo, NP had 7,722 Medicare Part D claims for 799 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.