Gillian Woodruff, MD
NPI 1598394496 · Internal Medicine Physician · Parker, AZ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gillian Woodruff, MD is a Internal Medicine Physician provider in Parker, AZ (NPI 1598394496).
Provider details
- NPI number
- 1598394496
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A192204 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 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
441 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 | 164 | $81 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 116 | $43 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 86 | $155 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 60 | $111 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 15 | $161 |
Typical Medicare-allowed amounts for these services range $43–$161 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 64 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 174 | 64 |
| Amlodipine Besylate | 131 | 40 |
| Rosuvastatin Calcium | 102 | 33 |
| Levothyroxine Sodium | 87 | 35 |
| Losartan Potassium | 76 | 24 |
| Lisinopril | 69 | 22 |
| Gabapentin |
Practice location
Mailing address
Additional practice locations (1)
- 5800 Hollis StEmeryville, CA 94608-2016Phone: (510) 806-2549
Registry dates
- Enumerated
- 2020-04-03
- Last updated
- 2026-01-12
- Certified
- 2026-01-12
Frequently asked questions
- What is Gillian Woodruff's NPI number?
- Gillian Woodruff's National Provider Identifier (NPI) is 1598394496, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gillian Woodruff's specialty?
- Gillian Woodruff is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gillian Woodruff located?
- Gillian Woodruff's practice location on file with NPPES is 12033 Agency Rd, Parker, AZ 85344-7718.
- What is Gillian Woodruff's phone number?
- The practice phone number listed in the NPPES registry for Gillian Woodruff is (928) 669-2137.
- Does Gillian Woodruff accept Medicare?
- Gillian Woodruff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gillian Woodruff's NPI active?
- Yes — Gillian Woodruff's NPI (1598394496) is active in the NPPES registry as of the last update on 2026-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.