Quick answers
- Which hospitals does John C. Grebeck work at?
- Medicare's official clinician data lists John C. Grebeck at 1 hospital: Lehigh Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John C. Grebeck see patients?
- Medicare's clinician data lists 10 practice locations, including Allentown, PA, Bethlehem, PA and Easton, PA. Call before your visit to confirm the address.
- What is John C. Grebeck's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does John C. Grebeck accept Medicare assignment?
- Yes. Medicare's clinician data says John C. Grebeck accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John C. Grebeck offer telehealth?
- Medicare's clinician data says John C. Grebeck offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John C. Grebeck?
- (610) 402-8355, as listed in official Medicare / NPI Registry data.
- What is John C. Grebeck's NPI number?
- 1093688350. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John C. Grebeck works
Medicare's Facility Affiliation Data lists John C. Grebeck at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lehigh Valley HospitalAllentown, PA · Acute Care Hospital · CCN 390133
Practice locations
Addresses where John C. Grebeck is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
- 1200 S Cedar Crest BlvdAllentown, PA 18103
- 1200 S Cedar Crest Blvd 3rd Fl Kasych, Lvpg Burn SurgeryAllentown, PA 18103 (610) 402‑8355
- 1200 S Cedar Crest Blvd Fl, 1 Lvpg NephrologyAllentown, PA 18103 (610) 402‑8510
- 1210 S Cedar Crest BlvdAllentown, PA 18103 (610) 402‑3888
- 1250 S Cedar Crest BlvdAllentown, PA 18103
Group practices
Medicare enrollment lists John C. Grebeck as a member of this group (CMS data updated 2026-10-02).
- Lehigh Valley Physician Group2,542 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Allentown
Clinicians with the same Medicare primary specialty in Allentown, PA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2025 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1093688350 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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