Doctor profile · Federal record
Dr. Maria Zalles, MD
Anatomic Pathology & Clinical Pathology Physician (CMS: Pathology) · Cytopathology Physician · Anatomic Pathology & Clinical Pathology Physician · Anatomic Pathology & Clinical Pathology Physician · Anatomic Pathology & Clinical Pathology Physician · Cytopathology Physician · Anatomic Pathology & Clinical Pathology Physician · Pediatric Pathology Physician · Round Rock, TX
- NPI 1134183759
- Accepts Medicare
- 42 yrs in practice
- Licensed in 5 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
201 Seton Pkwy, Seton Medical Center Williamson, Dept. of Pathology
Round Rock, TX 786658000
(203) 676-8400 - Additional location
-
550 University Blvd
Indianapolis, IN 462025149
(317) 944-5000 - Mailing address
-
250 N Shadeland Ave
Indianapolis, IN 462194959
Credentials & registration
- NPI registered
- April 2006 — 20 yrs on file
- Profile last updated
- November 21, 2025
- Year of graduation
- 1984 — 42 yrs since
- Specialty taxonomy
- 207ZP0102X — NUCC code
- State licenses (5)
- Connecticut #044040 · Missouri #101977 · Georgia #102400 · Indiana #01098530A · Kansas #04-23856
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1134183759. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,179
Distinct HCPCS
10
Medicare allowed
$56,049
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
88307 |
Pathology examination of tissue using a microscope, moderately high complexity | 271 | 81 | $79 | |
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 266 | 154 | $36 | |
88360 |
Microscopic genetic analysis of tumor, manual | 166 | 42 | $40 | |
88342 |
Special stained specimen slides to examine tissue, initial procedure | 151 | 95 | $33 | |
88341 |
Special stained specimen slides to examine tissue, each additional procedure | 143 | 62 | $27 | |
88331 |
Pathology examination of specimen during surgery, first tissue block | 57 | 27 | $59 | |
88321 |
Surgical pathology consultation and report on referred slides prepared elsewhere | 42 | 41 | $81 | |
88173 |
Evaluation of fine needle aspirate with interpretation and report | 34 | 28 | $67 | |
88300 |
Pathology examination of tissue using a microscope, limited examination | 33 | 33 | $4 | |
88172 |
Evaluation of fine needle aspirate | 16 | 14 | $34 |
In context: peer comparison
Among 5 peers in Round Rock Anatomic Pathology & Clinical Pathology Physician, average services per provider: 129. This provider delivers 9.1× the peer median.Open Payments
Industry payments received
All-time total
$41
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Merck Sharp & Dohme LLC | 1 | $23.41 | |
| Novartis Pharmaceuticals Corporation | 1 | $17.75 |
By nature of payment
Hospital affiliations
Frequently asked questions
What is Dr. Maria Zalles's medical specialty?
Dr. Maria Zalles practices Anatomic Pathology & Clinical Pathology Physician in Round Rock, TX.
Where does Dr. Maria Zalles practice?
Dr. Maria Zalles practices at 201 Seton Pkwy, Round Rock, TX 786658000. Office phone: 2036768400.
What is Dr. Maria Zalles's NPI?
Dr. Maria Zalles's National Provider Identifier (NPI) is 1134183759, issued by NPPES.
Does Dr. Maria Zalles accept Medicare assignment?
Yes. Dr. Maria Zalles accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Maria Zalles commonly perform?
Top Medicare-reported procedures in 2023: Pathology examination of tissue using a microscope, moderately high complexity (HCPCS 88307); Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Microscopic genetic analysis of tumor, manual (HCPCS 88360). Source: CMS Medicare Physician & Other Practitioners file.