Quick answers
- Does Ian J. Diehl accept Medicare assignment?
- Yes. Medicare's clinician data says Ian J. Diehl 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 Ian J. Diehl see?
- In 2024, CMS data shows 150 Original Medicare patients and 152 services for Ian J. Diehl. This counts Original Medicare only and measures volume, not quality.
- What is Ian J. Diehl's NPI number?
- 1821634585. 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 Ian J. Diehl, 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 | 150 |
|---|---|
| Services billed to Medicare | 152 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)82 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)54 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%
- Arthritis69%
- Anxiety45%
- Ischemic heart disease41%
- Stroke or mini-stroke41%
Hospitals where Ian J. Diehl works
Medicare's Facility Affiliation Data lists Ian J. Diehl 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.
- Lehigh Valley HospitalAllentown, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390133
Practice locations
Addresses where Ian J. Diehl is enrolled with Medicare (CMS data updated October 2, 2026).
- 1569 Medical Dr, Suite 202Pottstown, PA 19464 (484) 948‑3860
- 1581 N 9th StStroudsburg, PA 18360
- 801 Ostrm StBethlehem, PA 18015
Group practices
Medicare enrollment lists Ian J. Diehl as a member of these groups (CMS data updated October 2, 2026).
- Lehigh Valley Physician Group2,542 clinicians in the group
- St Lukes Physician Group Inc2,198 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Pottstown
Clinicians with the same Medicare primary specialty in Pottstown, PA — not a recommendation.
Other clinicians in Lehigh Valley Physician Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1821634585 |
| 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