Physician Profile
Unclaimed ProfileAbout LI
Mark W. Li, M.D. practises gastroenterology in Hacienda Hts, CA. Mark is a 1978 graduate of University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb).
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Li?
Dr. Li is a gastroenterology in Hacienda Hts, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “GASTROENTEROLOGY”.
NPI registry
What is Dr. Li's address?
Dr. Li is listed at 2440 S HACIENDA BLVD STE 105, Hacienda Hts, CA 91745. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Li?
The number on file is (626) 330-6003. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Li?
Dr. Li's National Provider Identifier is 1356375059. 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 Dr. Li train?
Dr. Li attended University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb), graduating in 1978. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Li have?
Dr. Li has 48 years experience. Calculated from a graduation year of 1978, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Li perform?
According to Medicare billing data, Dr. Li performs procedures including biopsy of large bowel using a flexible endoscope and biopsy of esophagus, stomach, and/or upper small 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
Is Dr. Li's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Li. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (626) 330-6003
- Email not available
Practice Locations
2440 S HACIENDA BLVD STE 105
Hacienda Hts, CA 91745
Procedures Most Often Billed to Medicare
822 services · 463 patients · 9 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
88 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
80 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
181 |
| Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes | Office visit | 99347 |
150 |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes | Office visit | 99307 |
120 |
| Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99348 |
97 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
66 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
29 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
11 |
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.
Trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) 8
Other providers in the same specialty who trained at the same institution.
Class of 1978 at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of large bowel using a flexible endoscope 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.