Gregory Walker, MD
NPI 1801250659 · Orthopaedic Foot and Ankle Surgery Physician · Tucson, AZ
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Walker, MD is a Orthopaedic Foot and Ankle Surgery Physician provider in Tucson, AZ (NPI 1801250659).
Provider details
- NPI number
- 1801250659
- Entity type
- Individual
- Primary specialty
- Orthopaedic Foot and Ankle Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
444 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 97 | $160 |
| X-Ray of Ankle, Minimum of 3 Views73610 | 90 | $35 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 78 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 64 | $88 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 39 | $107 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 69 | 44 |
| Oxycodone Hcl | 53 | 42 |
| Meloxicam | 42 | 30 |
| Ondansetron Hcl | 35 | 32 |
| Tramadol Hcl | 27 | 21 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 24 | 17 |
| Methylprednisolone | 17 | 17 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$466 across 33 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
- 2016-04-07
- Last updated
- 2022-11-28
- Certified
- 2022-11-28
Frequently asked questions
- What is Gregory Walker's NPI number?
- Gregory Walker's National Provider Identifier (NPI) is 1801250659, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Walker's specialty?
- Gregory Walker is listed in the NPPES registry with a primary specialty of Orthopaedic Foot and Ankle Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Walker located?
- Gregory Walker's practice location on file with NPPES is 6130 N La Cholla Blvd Ste 135a, Tucson, AZ 85741-3557.
- What is Gregory Walker's phone number?
- The practice phone number listed in the NPPES registry for Gregory Walker is (520) 881-1394.
- Does Gregory Walker accept Medicare?
- Gregory Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Walker's NPI active?
- Yes — Gregory Walker's NPI (1801250659) is active in the NPPES registry as of the last update on 2022-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.