Doctor profile · Federal record
Dr. Michael Chang, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Internal Medicine Physician · San Diego, CA
- NPI 1114155488
- Accepts Medicare
- 17 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
200 W Arbor Dr
San Diego, CA 921039000
(858) 249-6748 - Mailing address
-
Po Box 232410
San Diego, CA 921932410
Credentials & registration
- NPI registered
- June 2009 — 17 yrs on file
- Profile last updated
- August 25, 2017
- Year of graduation
- 2009 — 17 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #A114639
- Medicaid
- CA #1114155488
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1114155488. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
850
Distinct HCPCS
10
Medicare allowed
$115,481
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 137 | 130 | $53 | |
43259 |
Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 77 | 63 | $158 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 76 | 75 | $61 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 70 | 69 | $227 | |
74328 |
Review by radiologist of image from tube placement into bile duct using an endoscope | 64 | 46 | $24 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 60 | 57 | $115 | |
43264 |
Removal of stone or debris from bile or pancreatic duct using a flexible endoscope | 52 | 36 | $100 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 40 | 39 | $134 | |
43242 |
Ultrasound guided needle aspiration or biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 38 | 37 | $213 | |
43276 |
Replacement of stent in pancreatic or bile duct using a flexible endoscope | 36 | 18 | $408 |
In context: peer comparison
Among 31 peers in San Diego Gastroenterology Physician, average services per provider: 52. This provider delivers 16× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
453
Patients
174
Total drug cost
$78,437
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 69 | 31 | $940 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 68 | 62 | $5,292 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 59 | 54 | $1,001 |
| Famotidine | Generic | 42 | 15 | $604 |
| Pantoprazole Sodium | Generic | 36 | 0 | $351 |
| Sucralfate | Generic | 33 | 12 | $1,390 |
| Creon (Lipase/Protease/Amylase) | Brand | 27 | 0 | $44,045 |
| Linzess (Linaclotide) | Brand | 23 | 0 | $15,239 |
| Dicyclomine Hcl | Generic | 19 | 0 | $838 |
| Lubiprostone | Generic | 17 | 0 | $3,818 |
Hospital affiliations
Frequently asked questions
What is Dr. Michael Chang's medical specialty?
Dr. Michael Chang practices Gastroenterology Physician in San Diego, CA.
Where does Dr. Michael Chang practice?
Dr. Michael Chang practices at 200 W Arbor Dr, San Diego, CA 921039000. Office phone: 8582496748.
What is Dr. Michael Chang's NPI?
Dr. Michael Chang's National Provider Identifier (NPI) is 1114155488, issued by NPPES.
Does Dr. Michael Chang accept Medicare assignment?
Yes. Dr. Michael Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Michael Chang commonly perform?
Top Medicare-reported procedures in 2023: Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43259); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.