Alan W. Chang, MD

Medicare activity in 2024

Official CMS public-use data for Alan W. Chang, 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.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)251 services
2. Biopsy of large bowel using a flexible endoscope (45380)160 services
3. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)142 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)126 services
5. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)99 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 cholesterol75%
• High blood pressure72%
• Arthritis48%
• Anxiety31%
• Ischemic heart disease26%
• Depression25%

Hospitals where Alan W. Chang works

Medicare's Facility Affiliation Data lists Alan W. Chang 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.

• Doylestown HospitalDoylestown, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390203

Practice locations

Addresses where Alan W. Chang is enrolled with Medicare (CMS data updated October 2, 2026).

• 599 W State StDoylestown, PA 18901 (215) 345‑6050
• 599 W State Street, 200 Doylestown Health GastroenterologyDoylestown, PA 18901 (215) 345‑6050

Group practices

Medicare enrollment lists Alan W. Chang as a member of these groups (CMS data updated October 2, 2026).

• Via Affiliates180 clinicians in the group
• Clinical Specialty Associates171 clinicians in the group

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in Pennsylvania →

Other gastroenterologists in Doylestown

Clinicians with the same Medicare primary specialty in Doylestown, PA — not a recommendation.

• Kiley K. Walp, DO
• Marion Anna Protano, MD
• James M. Bohning, MD
• Woo Jung Lee, MD
• Hannah H. Do, MD
• Sandhya Salguti, MD

All gastroenterologists in Doylestown →

Other clinicians in Via Affiliates

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Alecia Wilson, NP
• Bryan S. Stone, DO
• John D. Harding, MD
• Megan J. Blatz, NP
• Paul Spiro, MD
• Soe Htay, MD

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians