Doctor profile · Federal record
Dr. Ann Lee, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Gastroenterology Physician · Downey, CA
- NPI 1396979126
- Accepts Medicare
- MIPS 81.5 / 100 · 2023
- 18 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
10441 Lakewood Blvd Ste B
Downey, CA 902412871
(562) 869-4497 - Additional location
-
8810 C Avenue, Apt 134
Hesperia, CA 92345
(714) 788-8218 - Additional location
-
9831 S Western Ave
Chicago, IL 606431740
(773) 445-3500 - Mailing address
-
Po Box 35380
Las Vegas, NV 891335380
Credentials & registration
- NPI registered
- May 2009 — 17 yrs on file
- Profile last updated
- December 29, 2025
- Year of graduation
- 2008 — 18 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State licenses (2)
- Illinois #036-167184 · California #136160
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1396979126. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
342
Distinct HCPCS
6
Medicare allowed
$35,991
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 141 | 90 | $77 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 73 | 71 | $127 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 38 | 38 | $101 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 38 | 37 | $95 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 29 | 18 | $107 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 23 | 22 | $229 |
In context: peer comparison
Among 2 peers in Downey Gastroenterology Physician, average services per provider: 41. This provider delivers 8.3× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. Ann Lee's medical specialty?
Dr. Ann Lee practices Gastroenterology Physician in Downey, CA.
Where does Dr. Ann Lee practice?
Dr. Ann Lee practices at 10441 Lakewood Blvd Ste B, Downey, CA 902412871. Office phone: 5628694497.
What is Dr. Ann Lee's NPI?
Dr. Ann Lee's National Provider Identifier (NPI) is 1396979126, issued by NPPES.
Does Dr. Ann Lee accept Medicare assignment?
Yes. Dr. Ann Lee accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ann Lee commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.