RYAN MATTHEW ACKER DO
NPI 1659949303
Emergency Medicine in Tulsa, OK
About Ryan Matthew Acker Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RYAN MATTHEW ACKER DO (NPI 1659949303) is an individual emergency medicine provider in Tulsa, Oklahoma, licensed in Oklahoma (8063) and active in the NPI registry since June 2021. He is enrolled in Medicare PECOS, is affiliated with Stillwater Medical Center, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Accepted 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
Ryan Matthew Acker Do 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.
Medicare Billing Reassignments
7Medicare enrollment records show Ryan Acker reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tulsa, OK 74104
- Reassigned Medicare billing, Oklahoma enrollment
- 162 clinicians in this Medicare group
Tulsa, OK 74136
- Reassigned Medicare billing, Oklahoma enrollment
- 263 clinicians in this Medicare group
Claremore, OK 74017
- Reassigned Medicare billing, Texas enrollment
- 1,047 clinicians in this Medicare group
Cleveland, OK 74020
- Reassigned Medicare billing, Oklahoma enrollment
- Also billed through NPI 1801020565 (Oklahoma)
- 34 clinicians in this Medicare group
Muskogee, OK 74401
- Reassigned Medicare billing, Texas enrollment
- 655 clinicians in this Medicare group
Stillwater, OK 74074
- Reassigned Medicare billing, Oklahoma enrollment
- 298 clinicians in this Medicare group
Lawton, OK 73507
- Reassigned Medicare billing, Texas enrollment
- 347 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Stillwater Medical Center
Acute Care Hospitals · Stillwater, OKSaint Francis Hospital, Inc
Acute Care Hospitals · Tulsa, OKHillcrest Hospital Cushing
Acute Care Hospitals · Cushing, OKCherokee Nation W W Hastings Indian Hospital
Acute Care Hospitals · Tahlequah, OKCleveland Area Hospital
Critical Access Hospitals · Cleveland, OKPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 74107 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
TULSA, OK 74107
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 Ryan Acker's NPI number?
The NPI number for Ryan Acker is 1659949303. It was assigned to this individual provider in the NPPES registry on June 17, 2021.
Where is Ryan Acker located?
Ryan Acker practices at 1111 W 17th St, Tulsa, OK 74107. The listed phone number is (918) 561-1232.
What is Ryan Acker's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ryan Acker enrolled in Medicare?
Yes. Ryan Acker 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 organizations bill Medicare for Ryan Acker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ryan Acker reassigns Medicare benefits to 7 organizations: Green Country Emergency Physicians Group Of Tulsa PLLC (Tulsa, OK), Ies ER Oklahoma LLC (Tulsa, OK), Cherokee Nation (Claremore, OK), Cleveland Area Hospital Holdings, Inc. (Cleveland, OK), Creek Nation Hospital & Clinics (Muskogee, OK) and 2 more organizations, listed in the Medicare section above. Each 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 Ryan Acker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ryan Acker accept?
Health plans from CommunityCare list Ryan Acker 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.
Is Ryan Acker affiliated with any hospitals?
According to CMS data, Ryan Acker is affiliated with Stillwater Medical Center, Saint Francis Hospital, Inc, Hillcrest Hospital Cushing, Cherokee Nation W W Hastings Indian Hospital and Cleveland Area Hospital.
When was this NPI record last updated?
The NPPES record for Ryan Acker was last updated on August 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.
# Ryan Matthew Acker, DO · NPI 1659949303
Emergency Medicine physician in Tulsa, Oklahoma. Individual provider, active in the CMS NPPES registry since June 17, 2021.
## Identity
- **NPI:** 1659949303 (Entity type: Individual)
- **Enumerated:** June 17, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 8063 (Oklahoma)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1111 W 17TH ST, Tulsa, OK 74107-1886
- **Phone:** (918) 561-1232
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Green Country Emergency Physicians Group Of Tulsa PLLC (NPI 1972698553, Tulsa, OK); Ies ER Oklahoma LLC (NPI 1447148093, Tulsa, OK); Cherokee Nation (NPI 1497568968, Claremore, OK); Cleveland Area Hospital Holdings, Inc. (NPI 1427295872, Cleveland, OK); Creek Nation Hospital & Clinics (NPI 1922873611, Muskogee, OK); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Oklahoma State University College Of Osteopathic Medicine, class of 2022
## Record status
- **NPPES last updated:** August 20, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1659949303) · Data from the CMS NPPES public registry.