Grayson Halladay, PA-C
NPI 1225589021 · Surgical Physician Assistant · Phoenix, AZ
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grayson Halladay, PA-C is a Surgical Physician Assistant provider in Phoenix, AZ (NPI 1225589021).
Provider details
- NPI number
- 1225589021
- Entity type
- Individual
- Primary specialty
- Surgical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
- Physician Assistant363A00000X
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
517 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 | 116 | $75 |
| X-Ray of Lower and Sacral Spine, 2-3 Views72100 | 111 | $32 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 89 | $102 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 48 | $136 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 43 | $14 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Diclofenac Sodium | 722 | 273 |
| Tizanidine Hcl | 503 | 260 |
| Oxycodone Hcl | 117 | 88 |
| Tramadol Hcl | 68 | 36 |
| Methylprednisolone | 65 | 65 |
| Celecoxib | 60 | 34 |
| Etodolac | 23 | — |
| Hydrocodone/Acetaminophen |
Practice location
Mailing address
Additional practice locations (1)
- 18444 N 25th Ave Ste 210Phoenix, AZ 85023-1264Phone: (866) 974-2673
Registry dates
- Enumerated
- 2016-10-18
- Last updated
- 2025-08-13
- Certified
- 2025-08-13
Frequently asked questions
- What is Grayson Halladay's NPI number?
- Grayson Halladay's National Provider Identifier (NPI) is 1225589021, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grayson Halladay's specialty?
- Grayson Halladay is listed in the NPPES registry with a primary specialty of Surgical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Grayson Halladay located?
- Grayson Halladay's practice location on file with NPPES is 9321 W Thomas Rd Ste 205, Phoenix, AZ 85037-3392.
- What is Grayson Halladay's phone number?
- The practice phone number listed in the NPPES registry for Grayson Halladay is (866) 974-2673.
- Does Grayson Halladay accept Medicare?
- Grayson Halladay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grayson Halladay's NPI active?
- Yes — Grayson Halladay's NPI (1225589021) is active in the NPPES registry as of the last update on 2025-08-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.