Justin Merszei, MD
NPI 1649252529 · Nephrology Physician · Houston, TX
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Merszei, MD is a Nephrology Physician provider in Houston, TX (NPI 1649252529).
Provider details
- NPI number
- 1649252529
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- L3016 (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
20 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
1,781 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 | 711 | $78 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 367 | $98 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 298 | $344 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 101 | $116 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 73 | $286 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 64 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 429 | 149 |
| Allopurinol | 320 | 85 |
| Losartan Potassium | 271 | 89 |
| Dapagliflozin Propanediolbrand: Farxiga | 258 | 62 |
| Calcifediolbrand: Rayaldee | 141 | 32 |
| Carvedilol | 137 | 46 |
| Lisinopril | 131 | 47 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,090 across 106 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
- 2005-11-16
- Last updated
- 2011-01-19
Frequently asked questions
- What is Justin Merszei's NPI number?
- Justin Merszei's National Provider Identifier (NPI) is 1649252529, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Merszei's specialty?
- Justin Merszei is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Merszei located?
- Justin Merszei's practice location on file with NPPES is 10023 South Main Suite C-9, Houston, TX 77025-5252.
- What is Justin Merszei's phone number?
- The practice phone number listed in the NPPES registry for Justin Merszei is (713) 496-1077.
- Does Justin Merszei accept Medicare?
- Justin Merszei is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Merszei's NPI active?
- Yes — Justin Merszei's NPI (1649252529) is active in the NPPES registry as of the last update on 2011-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.