Dr. Michael Chang, M.D.
What this data tells you about Dr. Chang
Dr. Michael Chang is a gastroenterology specialist in San Diego, CA, with 16 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 850 Medicare services across 738 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $821 from 15 pharmaceutical and/or device companies across 20 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in gastroenterology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Upper GI endoscopy with biopsy A procedure to collect tissue samples from the esophagus, stomach, or upper small intestine using a flexible tube with a camera. The samples are examined to check for abnormalities. |
137 | $41 | $1,215 |
| Endoscopic ultrasound of esophagus, stomach, or upper small bowel An ultrasound exam of the esophagus, stomach, and/or upper small bowel performed using a flexible endoscope. |
77 | $124 | $1,089 |
| Colonoscopy with biopsy A procedure to collect tissue samples from the large intestine using a flexible tube with a camera. The samples are examined to check for abnormalities or disease. |
76 | $50 | $1,612 |
| Colon polyp removal with endoscopic snare This procedure removes polyps or growths from the large bowel using a flexible tube with a camera and a wire loop tool. The snare is used to cut off the growths during the examination. |
70 | $186 | $1,813 |
| Radiologist review of bile duct tube placement imaging A radiologist reviews images taken during the placement of a tube into the bile duct using an endoscope. |
64 | $19 | $152 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
60 | $90 | $364 |
| Endoscopic removal of bile or pancreatic duct stone A flexible endoscope is used to remove stones or debris from the bile or pancreatic ducts. |
52 | $79 | $1,838 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
40 | $106 | $468 |
| Endoscopic ultrasound-guided needle biopsy A procedure using an ultrasound-equipped endoscope to guide a needle for tissue sampling of the esophagus, stomach, or upper small bowel. |
38 | $162 | $1,515 |
| Stent replacement in pancreatic or bile duct A flexible endoscope is used to remove an existing stent and insert a new one into the pancreatic or bile duct. |
36 | $325 | $1,841 |
| Pancreatic or bile duct stent insertion A flexible endoscope is used to place a stent into the pancreatic or bile duct to keep it open. |
30 | $312 | $1,729 |
| Moderate sedation during GI endoscopy Sedation services provided by the physician performing a gastrointestinal endoscopic procedure. This requires an independent trained observer to assist in monitoring the patient. |
24 | $4 | $204 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
22 | $53 | $247 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
21 | $109 | $558 |
| Esophageal or gastric stent placement A flexible endoscope is used to place a stent in the esophagus, stomach, or upper small bowel to keep the passage open. |
20 | $166 | $880 |
| Endoscopic removal of foreign body from esophagus, stomach, or upper small bowel A flexible endoscope is used to locate and remove a foreign object from the esophagus, stomach, or upper small intestine. |
18 | $57 | $1,188 |
| Balloon dilation of esophagus, stomach, or upper small bowel, less than 3.0 cm A procedure using a flexible endoscope to widen a narrowed section of the esophagus, stomach, or upper small bowel with a balloon that is less than 3.0 cm in length. |
18 | $100 | $3,213 |
| Initial hospital admission, high complexity Initial hospital inpatient or observation care for a new patient involving high-level medical decision making, with at least 75 minutes total time on the date of the encounter. |
18 | $143 | $688 |
| Other procedure on small bowel A surgical or medical intervention performed on the small intestine that does not fall under other specific categories. |
15 | $157 | $1,884 |
| Endoscopic destruction of esophagus, stomach, or bowel growth Removal of a polyp or growth in the esophagus, stomach, or upper small intestine using a flexible tube with a camera. The procedure is performed through the mouth to access and destroy the abnormal tissue. |
14 | $159 | $2,227 |
Industry Payment Transparency
Open Payments through 2023 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2023)
All-time payments by company (2018-2023) ›
Associated products mentioned in payments ›
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2023 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Chang is a mixed practice specialist, with moderate Medicare volume, with low-engagement industry engagement, with 16 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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