Quick answers
- Does Karl F. Frey accept Medicare assignment?
- Yes. Medicare's clinician data says Karl F. Frey 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.
- What is Karl F. Frey's NPI number?
- 1821091398. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karl F. Frey works
Medicare's Facility Affiliation Data lists Karl F. Frey 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.
- VHS Harlingen Hospital Company LLCHarlingen, TX · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 450033
Practice locations
Addresses where Karl F. Frey is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 E Pecan BlvdMcAllen, TX 78501 (956) 682‑5292
- 1622 N Ed Carey DrHarlingen, TX 78550 (956) 428‑4258
Group practices
Medicare enrollment lists Karl F. Frey as a member of this group (CMS data updated October 2, 2026).
- Rio Grande Oral and Maxillofacial Surgery, P.C.2 clinicians in the group
Specialties
- Maxillofacial Surgeryprimary
Other maxillofacial surgeons in Texas
Clinicians with the same Medicare primary specialty in Texas — not a recommendation.
Other clinicians in Rio Grande Oral and Maxillofacial Surgery, P.C.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DDS |
|---|---|
| Dental school | University Of Texas Hsc At Houston School Of Dentistry |
| Graduation year | 1981 (45 years since dental school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821091398 |
| 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
- 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