Doctor profile · Federal record
Dr. Timothy Chen, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · San Francisco, CA
- NPI 1699017707
- Accepts Medicare
- 13 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
2100 Webster St Ste 115
San Francisco, CA 941152374
(415) 387-8800
fax (415) 387-5204 - Additional location
-
2100 Webster St Ste 516
San Francisco, CA 941152381
(415) 600-2470
fax (415) 369-1292 - Additional location
-
3801 Sacramento St Ste 300
San Francisco, CA 941181625
(415) 600-2402
fax (415) 379-9870
Credentials & registration
- NPI registered
- March 2013 — 13 yrs on file
- Profile last updated
- February 14, 2022
- Year of graduation
- 2013 — 13 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #A136216
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1699017707. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,264
Distinct HCPCS
10
Medicare allowed
$174,511
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 317 | 157 | $88 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 211 | 202 | $193 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 182 | 176 | $113 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 168 | 168 | $153 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 149 | 118 | $107 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 124 | 124 | $130 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 76 | 76 | $280 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 13 | 13 | $192 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 12 | 11 | $120 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 12 | 12 | $186 |
In context: peer comparison
Among 24 peers in San Francisco Gastroenterology Physician, average services per provider: 42. This provider delivers 30× the peer median.Open Payments
Industry payments received
All-time total
$1,870
Transactions
65
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Janssen Biotech, INC. | 12 | $362.32 | |
| Abbvie INC. | 14 | $290.78 | |
| Medtronic, INC. | 1 | $132.01 | |
| Intercept Pharmaceuticals, INC. | 5 | $125.92 | |
| Pfizer INC. | 6 | $117.48 | |
| Ironwood Pharmaceuticals, INC | 5 | $114.49 | |
| Merck Sharp & Dohme LLC | 4 | $97.61 | |
| Celltrion USA INC. | 4 | $84.30 | |
| Regeneron Healthcare Solutions, INC. | 2 | $74.53 | |
| Gilead Sciences, INC. | 3 | $70.16 | |
| Lilly USA, LLC | 2 | $65.51 | |
| Madrigal Pharmaceuticals | 2 | $45.83 | |
| Phathom Pharmaceuticals, INC. | 2 | $41.92 | |
| Genzyme Corporation | 1 | $41.54 | |
| Takeda Pharmaceuticals U.S.A., INC. | 2 | $39.86 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
754
Patients
500
Total drug cost
$130,215
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 254 | 153 | $6,821 |
| Gavilyte-C (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 160 | 157 | $3,144 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 72 | 71 | $5,399 |
| Famotidine | Generic | 62 | 22 | $1,572 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 49 | 48 | $845 |
| Omeprazole | Generic | 26 | 0 | $382 |
| Mesalamine | Generic | 25 | 0 | $14,104 |
| Mesalamine ER (Mesalamine) | Brand | 20 | 0 | $7,274 |
| Suprep (Sodium, Potassium,Mag Sulfates) | Brand | 19 | 19 | $2,281 |
| Vemlidy (Tenofovir Alafenamide) | Brand | 18 | 0 | $44,792 |
Frequently asked questions
What is Dr. Timothy Chen's medical specialty?
Dr. Timothy Chen practices Gastroenterology Physician in San Francisco, CA.
Where does Dr. Timothy Chen practice?
Dr. Timothy Chen practices at 2100 Webster St Ste 115, San Francisco, CA 941152374. Office phone: 4153878800.
What is Dr. Timothy Chen's NPI?
Dr. Timothy Chen's National Provider Identifier (NPI) is 1699017707, issued by NPPES.
Does Dr. Timothy Chen accept Medicare assignment?
Yes. Dr. Timothy Chen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Timothy Chen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.