Quick answers
- Does Gregory W. Dinwiddie accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory W. Dinwiddie accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gregory W. Dinwiddie see?
- In 2024, CMS data shows 147 Original Medicare patients and 287 services for Gregory W. Dinwiddie. This counts Original Medicare only and measures volume, not quality.
- What is Gregory W. Dinwiddie's NPI number?
- 1578567848. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gregory W. Dinwiddie, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 147 |
|---|---|
| Services billed to Medicare | 287 |
| Different services or procedures | 52 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Insertion of non-tunneled central venous tube for infusion (5 years or older) (36556)89 services
- Harvest of vein using an endoscope (33508)26 services
- Coronary artery bypass using artery graft, 1 graft (33533)24 services
- Partial destruction and reconstruction of right upper heart chamber (33257)19 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease71%
- Diabetes65%
- Chronic kidney disease64%
- Heart failure63%
Hospitals where Gregory W. Dinwiddie works
Medicare's Facility Affiliation Data lists Gregory W. Dinwiddie at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- INTEGRIS Baptist Medical Center, IncOklahoma City, OK · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 370028
- INTEGRIS Health Edmond HospitalEdmond, OK · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 370236
- INTEGRIS Southwest Medical CenterOklahoma City, OK · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 370106
Practice locations
Addresses where Gregory W. Dinwiddie is enrolled with Medicare (CMS data updated October 2, 2026).
- 3433 NW 56th StOklahoma City, OK 73112
- 3433 NW 56th St, Suite 760Oklahoma City, OK 73112 (405) 951‑4345
- 4221 S Western Ave, 2010 Southwest CvcOklahoma City, OK 73109 (405) 644‑5120
Group practices
Medicare enrollment lists Gregory W. Dinwiddie as a member of this group (CMS data updated October 2, 2026).
- INTEGRIS Cardiovascular Physicians LLC116 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Oklahoma City
Clinicians with the same Medicare primary specialty in Oklahoma City, OK — not a recommendation.
Other clinicians in INTEGRIS Cardiovascular Physicians LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578567848 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians