Katherine Greenwalt, FNP-C
NPI 1639763675 · Family Nurse Practitioner · Pasadena, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Greenwalt, FNP-C is a Family Nurse Practitioner provider in Pasadena, CA (NPI 1639763675).
Provider details
- NPI number
- 1639763675
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- 95027605 (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 tenure33% of score
5 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 542 | 122 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 267 | 61 |
| Gabapentin | 241 | 69 |
| Celecoxib | 213 | 75 |
| Baclofen | 156 | 53 |
| Lidocaine | 148 | 36 |
| Morphine Sulfatebrand: Morphine Sulfate Er |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$724 across 41 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-02-20
- Last updated
- 2024-07-13
- Certified
- 2024-07-13
Frequently asked questions
- What is Katherine Greenwalt's NPI number?
- Katherine Greenwalt's National Provider Identifier (NPI) is 1639763675, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Greenwalt's specialty?
- Katherine Greenwalt is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Katherine Greenwalt located?
- Katherine Greenwalt's practice location on file with NPPES is 1017 S Fair Oaks Ave, Pasadena, CA 91105-2621.
- What is Katherine Greenwalt's phone number?
- The practice phone number listed in the NPPES registry for Katherine Greenwalt is (626) 403-6200.
- Does Katherine Greenwalt accept Medicare?
- Katherine Greenwalt is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Greenwalt's NPI active?
- Yes — Katherine Greenwalt's NPI (1639763675) is active in the NPPES registry as of the last update on 2024-07-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.