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Edit this profileWhere to find Ann J. Lee, M.D.
- Downey location main office
10441 Lakewood Blvd Ste B, Downey, CA 90241 - Chicago location
9831 S Western Ave, Chicago, IL 60643 - Hesperia location
8810 C Avenue, Apt 134, Hesperia, CA 92345
About Dr. Lee
Ann J. Lee, M.D. is a healthcare provider in Downey, CA specializing in gastroenterology. According to Medicare claims data, Ann cared for 75 Medicare patients across 75 services. The services billed most often include initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope, and initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes. This provider record is associated with NPI 1396979126.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (562) 869-4497
- Email not available
Practice Locations
10441 LAKEWOOD BLVD STE B
Downey, CA 90241
9831 S Western Ave
Chicago, IL 60643
8810 C Avenue Apt 134
Hesperia, CA 92345
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
- Acute pancreatitis
- Gallstones
- Pancreatic cysts
- Primary sclerosing cholangitis
Colon and anorectal
Esophagus and swallowing
- Barrett's esophagus
- Eosinophilic esophagitis
- Esophageal stricture
- Esophagitis
Functional bowel and motility
- Chronic diarrhea
- Fecal incontinence
- Small intestinal bacterial overgrowth
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
- Functional dyspepsia
- Gastritis
- Gastroparesis
- H. pylori infection
- Peptic ulcer disease
Bowel & Colon
Digestive Symptoms
- Constipation
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
- Colonoscopy
- Endoscopy
- Gallbladder removal
- Hernia repair
- Liver biopsy
Lower endoscopy
- Colon polyp removal
- Endoscopic control of gastrointestinal bleeding
- Flexible sigmoidoscopy
Upper endoscopy
- Endoscopic submucosal dissection
- Esophageal dilation
Capsule and physiology testing
- Anorectal manometry
- Capsule endoscopy
- Esophageal manometry
Diagnostic Testing
- 24-Hour Acid Reflux Test
- EUS-Guided Fine Needle Biopsy
- H. Pylori Breath Test
- SIBO Breath Test
Liver procedures
- Esophageal variceal banding
- Liver elastography
- Paracentesis
Treatments
Procedures Most Often Billed to Medicare
75 services · 75 patients · 4 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
20 | Less often than most peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
11 | Less often than most peers in Gastroenterology |
| Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | Office visit | 99221 |
28 | More often than most peers in Gastroenterology |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
16 | Less often than most peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other gastroenterologists in Downey 6
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2008 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Ann J. Lee?
Ann J. Lee is a gastroenterologist in Downey, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
What is Ann J. Lee's address?
Ann J. Lee is listed at 10441 Lakewood Blvd Ste B, Downey, CA 90241. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Ann J. Lee?
The number on file is (562) 869-4497. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Ann J. Lee's NPI number?
Ann J. Lee's National Provider Identifier is 1396979126. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Ann J. Lee train?
Ann J. Lee attended Other, graduating in 2008. This comes from the CMS National Downloadable File.
CMS public data
How long has Ann J. Lee been practicing?
Ann J. Lee has 18 years experience. Calculated from a graduation year of 2008, reported in the CMS National Downloadable File.
CMS public data
What procedures does Ann J. Lee perform?
According to Medicare billing data, Ann J. Lee performs procedures including biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and biopsy of large bowel using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Ann J. Lee confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Ann J. Lee. If this is you, claiming it is free.
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