Quick answers
- Does Tammy Vermeulen accept Medicare assignment?
- Yes. Medicare's clinician data says Tammy Vermeulen 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 Tammy Vermeulen see?
- In 2024, CMS data shows 331 Original Medicare patients and 457 services for Tammy Vermeulen. This counts Original Medicare only and measures volume, not quality.
- What is Tammy Vermeulen's NPI number?
- 1598095143. 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 Tammy Vermeulen, 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 | 331 |
|---|---|
| Services billed to Medicare | 457 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Hospital discharge day management, 30 minutes or less (99238)179 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)169 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)41 services
- Hospital discharge day management, more than 30 minutes (99239)29 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)21 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%
- Chronic kidney disease57%
- Arthritis56%
- Ischemic heart disease50%
- Diabetes48%
Hospitals where Tammy Vermeulen works
Medicare's Facility Affiliation Data lists Tammy Vermeulen 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
Practice locations
Addresses where Tammy Vermeulen is enrolled with Medicare (CMS data updated October 2, 2026).
- 4221 S Western Ave, 4005 INTEGRIS Ent SouthwestOklahoma City, OK 73109 (405) 644‑5190
Group practices
Medicare enrollment lists Tammy Vermeulen as a member of this group (CMS data updated October 2, 2026).
- INTEGRIS Ambulatory Care Corporation685 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Oklahoma City
Clinicians with the same Medicare primary specialty in Oklahoma City, OK — not a recommendation.
Other clinicians in INTEGRIS Ambulatory Care Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598095143 |
| 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