Doctor profile · Federal record
Dr. Carlos Zem, MD
Nephrology Physician (CMS: Nephrology) · San Antonio, TX
- NPI 1437237914
- Accepts Medicare
- 24 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1123 N Main Ave Ste 120
San Antonio, TX 782124738
(210) 226-2001 - Mailing address
-
16620 N US Highway 281, Ste 300
San Antonio, TX 782322327
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- March 14, 2025
- Year of graduation
- 2002 — 24 yrs since
- Specialty taxonomy
- 207RN0300X — NUCC code
- State license (1)
- Texas #N2350
- Medicaid
- TX #203476101
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1437237914. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
2,131
Distinct HCPCS
10
Medicare allowed
$310,048
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 392 | 50 | $336 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 328 | 62 | $58 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 324 | 122 | $114 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 298 | 103 | $76 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 219 | 108 | $101 | |
99439 |
Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month | 121 | 49 | $45 | |
90966 |
Home dialysis services per month (20 years or older) | 110 | 22 | $277 | |
90935 |
Hemodialysis procedure with physician evaluation | 76 | 41 | $68 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 59 | 56 | $165 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 50 | 41 | $125 |
In context: peer comparison
Among 47 peers in San Antonio Nephrology Physician, average services per provider: 133. This provider delivers 16× the peer median.Open Payments
Industry payments received
All-time total
$216
Transactions
5
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| AstraZeneca Pharmaceuticals Lp | 1 | $134.42 | |
| Novartis Pharmaceuticals Corporation | 1 | $26.50 | |
| Lilly USA, LLC | 1 | $21.97 | |
| Ardelyx, INC. | 1 | $18.89 | |
| Novo Nordisk INC | 1 | $14.13 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,538
Patients
560
Total drug cost
$641,291
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Carvedilol | Generic | 232 | 84 | $2,540 |
| Losartan Potassium | Generic | 225 | 74 | $3,869 |
| Sevelamer Carbonate | Generic | 124 | 43 | $57,119 |
| Furosemide | Generic | 116 | 48 | $848 |
| Gentamicin Sulfate | Generic | 108 | 30 | $973 |
| Jardiance (Empagliflozin) | Brand | 103 | 38 | $143,672 |
| Auryxia (Ferric Citrate) | Brand | 96 | 24 | $197,834 |
| Tamsulosin Hcl | Generic | 93 | 39 | $2,126 |
| Nifedipine ER (Nifedipine) | Brand | 85 | 30 | $5,085 |
| Pantoprazole Sodium | Generic | 76 | 32 | $1,322 |
Hospital affiliations
Frequently asked questions
What is Dr. Carlos Zem's medical specialty?
Dr. Carlos Zem practices Nephrology Physician in San Antonio, TX.
Where does Dr. Carlos Zem practice?
Dr. Carlos Zem practices at 1123 N Main Ave Ste 120, San Antonio, TX 782124738. Office phone: 2102262001.
What is Dr. Carlos Zem's NPI?
Dr. Carlos Zem's National Provider Identifier (NPI) is 1437237914, issued by NPPES.
Does Dr. Carlos Zem accept Medicare assignment?
Yes. Dr. Carlos Zem accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Carlos Zem commonly perform?
Top Medicare-reported procedures in 2023: Dialysis services, 4 or more physician visits per month (20 years or older) (HCPCS 90960); Chronic care management services (HCPCS 99490); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.