Carlos H. Zem, MD
Nephrology Physician · San Antonio, TX
Carlos H. Zem, MD is a nephrology physician with a practice address in San Antonio, Texas, and NPI 1437237914, issued on Nov 1, 2006. Check the license (Texas N2350, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Carlos H. Zem
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- N2350 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1123 N Main Ave Ste 120, San Antonio, TX 78212
- Phone
- (210) 226-2001
- Enumerated
- Nov 1, 2006
- Record last updated
- Mar 14, 2025
- Medicaid ID
- 203476101 TX
- Medicare enrollment
- Enrolled (PECOS I20090630000072); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,159 in Texas → Look up another NPI →
Also registered at 1123 N Main Ave Ste 120
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Muhammad Abdullah, MDNephrology Physician1154614832
- Ronald Hamner, M.D.Nephrology Physician1467427401
- Robert Holub, M.D.Nephrology Physician1083667893
- Alwin Lopez-ToroNephrology Physician1962820506
- Luz Moreno, MDNephrology Physician1790751592
- Pablo Pergola, MDNephrology Physician1902872765
Verify Carlos H. Zem in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license N2350Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% more Medicare Part D claims than the average nephrology physician in 2024
2,921 Medicare Part D claims for 361 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. 36 claims were for opioids.
Most prescribed
- Carvedilol280 claims
- Losartan Potassium208 claims
- Jardiance202 claims
- Nifedipine Er118 claims
- Mounjaro113 claims
- Tamsulosin Hcl109 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $215.91
5 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Renal Associates, P.A.San Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Carlos H. Zem among 1,159 nephrology physician records in Texas
Carlos H. Zem, MD is one of 1,159 nephrology physician records with a practice address in Texas. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 15% of them.
- NPI issued2006 · 15% of these records are older, 53% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 82% of these records are
- Graduated2002 · median 2001 among the 954 with a school on file
- Record last updated2025 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Texas
There are 1,159 nephrology physician records in Texas.
All 1,159 in Texas → Every provider in San Antonio → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Muhammad Abdullah, MDSan Antonio, TX 782121154614832
- Ronald Hamner, M.D.San Antonio, TX 782121467427401
- Robert Holub, M.D.San Antonio, TX 782121083667893
- Edward Lazaga, M.D.San Antonio, TX 782121396729547
- Alwin Lopez-ToroSan Antonio, TX 782121962820506
- Luz Moreno, MDSan Antonio, TX 782121790751592
- Pablo Pergola, MDSan Antonio, TX 782121902872765
- Jose Ramirez, M.D.San Antonio, TX 782121801862628
Common questions
What is Carlos H. Zem, MD's NPI number?
Carlos H. Zem, MD's National Provider Identifier (NPI) is 1437237914, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Carlos H. Zem, MD located?
The NPPES record lists a practice address at 1123 N Main Ave Ste 120, San Antonio, TX, 78212. Phone: (210) 226-2001. Providers update this record themselves, so call before visiting.
How can I verify Carlos H. Zem, MD's license?
NPPES lists Texas license number N2350, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Carlos H. Zem, MD prescribe under Medicare Part D?
In 2024, Carlos H. Zem, MD had 2,921 Medicare Part D claims for 361 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.