Caroline Onstott, PA-C
NPI 1689635393 · Physician Assistant · Phoenix, AZ
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Caroline Onstott, PA-C is a Physician Assistant provider in Phoenix, AZ (NPI 1689635393).
Provider details
- NPI number
- 1689635393
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- PA18212 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
61 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) |
|---|---|---|
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 27 | $40 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 21 | $64 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 13 | $66 |
Typical Medicare-allowed amounts for these services range $40–$66 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 25 | 21 |
| Oxycodone Hcl | 20 | 20 |
| Finasteride | 14 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 5777 E Mayo BlvdDepartment of UrologyPhoenix, AZ 85054Phone: (480) 342-3868Fax: (480) 342-2799
Registry dates
- Enumerated
- 2006-03-31
- Last updated
- 2020-09-03
- Certified
- 2020-09-03
Frequently asked questions
- What is Caroline Onstott's NPI number?
- Caroline Onstott's National Provider Identifier (NPI) is 1689635393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Caroline Onstott's specialty?
- Caroline Onstott is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Caroline Onstott located?
- Caroline Onstott's practice location on file with NPPES is 5777 E Mayo Blvd, Phoenix, AZ 85054-4502.
- What is Caroline Onstott's phone number?
- The practice phone number listed in the NPPES registry for Caroline Onstott is (480) 301-8000.
- Does Caroline Onstott accept Medicare?
- Caroline Onstott is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Caroline Onstott's NPI active?
- Yes — Caroline Onstott's NPI (1689635393) is active in the NPPES registry as of the last update on 2020-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.