Gillian Hamilton, MD,PHD
NPI 1275572711 · Internal Medicine Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gillian Hamilton, MD,PHD is a Internal Medicine Physician provider in Phoenix, AZ (NPI 1275572711).
Provider details
- NPI number
- 1275572711
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD,PHD
- Sex
- Female
- Sole proprietor
- No
- License
- 13608 (AZ)
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
210 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) |
|---|---|---|
| Management of New Patient-Caregiver Dyad With Dementia, Moderate Complexity, for Use in Cmmi ModelG0520 | 116 | $265 |
| Management of New Patient-Caregiver Dyad With Dementia, Low Complexity, for Use in Cmmi ModelG0519 | 94 | $145 |
Typical Medicare-allowed amounts for these services range $145–$265 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2021-11-05
- Certified
- 2021-11-01
Frequently asked questions
- What is Gillian Hamilton's NPI number?
- Gillian Hamilton's National Provider Identifier (NPI) is 1275572711, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gillian Hamilton's specialty?
- Gillian Hamilton is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gillian Hamilton located?
- Gillian Hamilton's practice location on file with NPPES is 1510 E Flower St, Phoenix, AZ 85014-5698.
- What is Gillian Hamilton's phone number?
- The practice phone number listed in the NPPES registry for Gillian Hamilton is (602) 530-6900.
- Does Gillian Hamilton accept Medicare?
- Gillian Hamilton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gillian Hamilton's NPI active?
- Yes — Gillian Hamilton's NPI (1275572711) is active in the NPPES registry as of the last update on 2021-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.