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GREGORY TRENT WALKER JR. MD
NPI 1801250659
Orthopaedic Surgery - Foot and Ankle Surgery in Tucson, AZ

Active since April 07, 2016PECOS EnrolledAccepts Medicare Assignment
89.28/100
CMS Quality Rating
6130 N LA CHOLLA BLVD STE 135A, TUCSON, AZ 85741(520) 881-1394(520) 882-7464 Get Directions Write a Review

NPPES record last updated: November 28, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 28, 2022, Aug 20, 2021, Jun 29, 2021 and 1 more (4 updates tracked since 2021).

About Gregory Trent Walker Jr. Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY TRENT WALKER JR. MD (NPI 1801250659) is an individual foot and ankle surgery provider in Tucson, Arizona, licensed in Arizona (85758) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS and is a graduate of Other (2016).

NPPES Registry Identity

NPI1801250659
Entity TypeIndividualMale
Primary Taxonomy207XX0004X
Provider Legal NameGREGORY TRENT WALKER JR.Credential: MD
Location Address6130 N LA CHOLLA BLVD STE 135ATucson, AZ 85741-3557
Mailing Address6130 N La Cholla Blvd Ste 135aTucson, AZ 85741-3557 · (520) 881-1394 · Fax (520) 882-7464
Phone(520) 881-1394
Fax(520) 882-7464
Sole ProprietorNo
Medical School CMSOtherGraduated 2016
Enumeration DateApril 7, 2016
Last NPPES UpdateNovember 28, 20224 updates tracked since enumeration
NPPES CertifiedNovember 28, 2022
✔ NPI 1801250659 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic Surgery · Foot and Ankle SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207XX0004X
License✔ Licensed in AZ · 85758
Definition
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, foot and ankle surgeons deal with adult reconstructive foot and ankle surgery, adult foot and ankle trauma, sports medicine foot and ankle, and children's foot and ankle reconstructive surgery.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
6130 N LA CHOLLA BLVD STE 135A, Tucson, AZ 85741
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Other Identifiers 1

Medicaid250013578NV

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Blue Cross Blue Shield of Arizona and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gregory Trent Walker Jr. Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8426453044
PECOS Enrollment IDI20220805000609
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Gregory Walker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Tucson Physician Group Holdings, LLC
6.4 mi
Interventional Cardiology
395 N SILVERBELL RD STE 355
Tucson, AZ 85745
  • Reassigned Medicare billing, Arizona enrollment
  • 293 clinicians in this Medicare group
NPI 1356726939 (520) 622-5912

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301
Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.
148 services24 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
97 services97 patients
X-ray of ankle, minimum of 3 views 73610
An ankle X-ray is a quick, painless imaging test. It involves capturing at least three different images or 'views' of your ankle using small amounts of radiation. These images help identify any abnormalities or injuries, such as fractures or arthritis.
90 services74 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
78 services61 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
64 services53 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
39 services39 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

89.28/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality78.56
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

OLIVIA KATHERINE SOBOJINSKI PA-C
Physician Assistant
6130 N LA CHOLLA BLVD STE 135A
TUCSON, AZ 85741
Pima County (520) 881-1394
DEVVIN L CUBRA PA-C
Physician Assistant
6130 N LA CHOLLA BLVD STE 135A
TUCSON, AZ 85741
Pima County (520) 881-1394
DR. STEVEN GEORGE WARD DO
Orthopaedic Surgery
6130 N LA CHOLLA BLVD STE 135A
TUCSON, AZ 85741
Pima County (520) 881-1394

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Walker's NPI number?

The NPI number for Gregory Walker is 1801250659. It was assigned to this individual provider in the NPPES registry on April 7, 2016.

Where is Gregory Walker located?

Gregory Walker practices at 6130 N La Cholla Blvd Ste 135A, Tucson, AZ 85741. The listed phone number is (520) 881-1394.

What is Gregory Walker's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Foot and Ankle Surgery, with taxonomy code 207XX0004X.

Is Gregory Walker enrolled in Medicare?

Yes. Gregory Walker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Gregory Walker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Walker reassigns Medicare benefits to Tucson Physician Group Holdings, LLC (Tucson, AZ). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Walker accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Blue Cross Blue Shield of Arizona, Imperial Insurance Companies, Inc. and Oscar Health Plan, Inc. and 1 other insurer list Gregory Walker as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Gregory Walker was last updated on November 28, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.