Quick answers
- Does Joseph J. Herdman accept Medicare assignment?
- Yes. Medicare's clinician data says Joseph J. Herdman 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 Joseph J. Herdman see?
- In 2024, CMS data shows 650 Original Medicare patients and 9,024 services for Joseph J. Herdman. This counts Original Medicare only and measures volume, not quality.
- What is Joseph J. Herdman's NPI number?
- 1417148131. 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 Joseph J. Herdman, 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 | 650 |
|---|---|
| Services billed to Medicare | 9,024 |
| Different services or procedures | 50 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, vedolizumab, intravenous, 1 mg (J3380)5,700 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)162 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)132 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)124 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)119 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%
- Arthritis50%
- Ischemic heart disease34%
- Diabetes30%
- Anxiety29%
Hospitals where Joseph J. Herdman works
Medicare's Facility Affiliation Data lists Joseph J. Herdman 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.
- Bryn Mawr HospitalBryn Mawr, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390139
- Main Line Hospital LankenauWynnewood, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390195
- Paoli HospitalPaoli, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390153
- Riddle Memorial HospitalMedia, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390222
Practice locations
Addresses where Joseph J. Herdman is enrolled with Medicare (CMS data updated October 2, 2026).
- 1088 W Baltimore Pike Hcc II, 2 Main Line Gastroenterology Associates PCMedia, PA 19063 (610) 565‑1808
Group practices
Medicare enrollment lists Joseph J. Herdman as a member of this group (CMS data updated October 2, 2026).
- Regional Gastroenterology Associates of Lancaster, Ltd.244 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Media
Clinicians with the same Medicare primary specialty in Media, PA — not a recommendation.
Other clinicians in Regional Gastroenterology Associates of Lancaster, Ltd.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417148131 |
| 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