Mark Liong, M.D.
NPI 1346422078 · Nephrology Physician · Mcallen, TX
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Liong, M.D. is a Nephrology Physician provider in Mcallen, TX (NPI 1346422078).
Provider details
- NPI number
- 1346422078
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- P4673 (TX)
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
18 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
934 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 230 | $79 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 229 | $357 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 220 | $118 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 93 | $129 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 79 | $297 |
| Hemodialysis Procedure With Physician Evaluation90935 | 53 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sevelamer Carbonate | 312 | 64 |
| Ferric Citratebrand: Auryxia | 278 | 50 |
| Nifedipinebrand: Nifedipine Er | 83 | 25 |
| Sodium Zirconium Cyclosilicatebrand: Lokelma | 82 | 22 |
| Sucroferric Oxyhydroxidebrand: Velphoro | 77 | 16 |
| Amlodipine Besylate | 54 | 14 |
| Patiromer Calcium Sorbitexbrand: Veltassa |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$649 across 23 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
- 2007-12-05
- Last updated
- 2015-01-08
Frequently asked questions
- What is Mark Liong's NPI number?
- Mark Liong's National Provider Identifier (NPI) is 1346422078, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Liong's specialty?
- Mark Liong is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Liong located?
- Mark Liong's practice location on file with NPPES is 1901 S 1st St Ste 600, Mcallen, TX 78503-1228.
- What is Mark Liong's phone number?
- The practice phone number listed in the NPPES registry for Mark Liong is (956) 631-6136.
- Does Mark Liong accept Medicare?
- Mark Liong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Liong's NPI active?
- Yes — Mark Liong's NPI (1346422078) is active in the NPPES registry as of the last update on 2015-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.