Mark Li, M.D.
NPI 1356375059 · Gastroenterology Physician · Hacienda Hts, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Li, M.D. is a Gastroenterology Physician provider in Hacienda Hts, CA (NPI 1356375059).
Provider details
- NPI number
- 1356375059
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G44985 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
822 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 181 | $94 |
| Residence Visit for Established Patient With Straightforward Medical Decision Making, Per Day, If Using Time, at Least 15 Minutes99347 | 150 | $45 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, at Least 10 Minutes99307 | 120 | $41 |
| Residence Visit for Established Patient With Low Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99348 | 97 | $76 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 88 | $196 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 105 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 603 | 298 |
| Sucralfate | 359 | 177 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 248 | 246 |
| Amlodipine Besylate | 209 | 33 |
| Atorvastatin Calcium | 155 | 31 |
| Levetiracetam | 152 | 15 |
| Levothyroxine Sodium | 145 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$919 across 15 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-10
- Last updated
- 2019-05-24
Frequently asked questions
- What is Mark Li's NPI number?
- Mark Li's National Provider Identifier (NPI) is 1356375059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Li's specialty?
- Mark Li is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Li located?
- Mark Li's practice location on file with NPPES is 2440 S Hacienda Blvd Ste 105, Hacienda Hts, CA 91745-4763.
- What is Mark Li's phone number?
- The practice phone number listed in the NPPES registry for Mark Li is (626) 330-6003.
- Does Mark Li accept Medicare?
- Mark Li is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Li's NPI active?
- Yes — Mark Li's NPI (1356375059) is active in the NPPES registry as of the last update on 2019-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.