Maria S. Rayas, MD
Pediatric Endocrinology Physician · San Antonio, TX
Maria S. Rayas, MD is a pediatric endocrinology physician with a practice address in San Antonio, Texas, and NPI 1457536328, issued on Jan 9, 2008. Check the license (Texas N6606, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Maria S. Rayas
- Credential
- MD
- Primary taxonomy
- Pediatric Endocrinology Physician 2080P0205X
- License number
- N6606 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4502 Medical Dr, San Antonio, TX 78229
- Phone
- (210) 358-2015
- Enumerated
- Jan 9, 2008
- Record last updated
- Oct 12, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicaid ID
- 322853801 TX
- Medicare enrollment
- Enrolled (PECOS I20130830000547); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At San Antonio, 2007
- Entity
- Type 1 · individual
8 nearest pediatric endocrinology physician records → All 146 in Texas → Look up another NPI →
Also registered at 4502 Medical Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Maria S. Rayas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license N6606Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average pediatric endocrinology physician in 2024
65 Medicare Part D claims, against an average of 105 among the 386 providers of this specialty who prescribed in Part D. Brand-name drugs were 66% of 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: $323.41
12 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 931 providers of this specialty with any payment received $4,382.94 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
- University OF Texas Health Science Center AT San AntonioSan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria S. Rayas among 146 pediatric endocrinology physician records in Texas
Maria S. Rayas, MD is one of 146 pediatric endocrinology physician records with a practice address in Texas. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 47% of them.
- NPI issued2008 · 47% of these records are older, 47% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 34% of these records are
- Graduated2007 · median 2007 among the 50 with a school on file
- Record last updated2015 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0205X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Endocrinology Physician providers in Texas
There are 146 pediatric endocrinology physician records in Texas.
All 146 in Texas → Every provider in San Antonio → Pediatric Endocrinology Physician nationwide →
The 8 pediatric endocrinology physician records with the nearest ZIP codes
- Mark Danney, M.D.San Antonio, TX 782291629034657
- Carisse Orsi, MDSan Antonio, TX 782291235313073
- Lauren Pankratz, M.D.San Antonio, TX 782291568675726
- Carla Scott, MDSan Antonio, TX 782291639180243
- Ann Straight, M.D.San Antonio, TX 782291740244045
- Daniel Hammond, M.D.Fort Sam Houston, TX 782341003203159
- Jenna Macauley, DO, MS, FAAPSan Antonio, TX 782341295356624
- Candace Percival, M.D.Fort Sam Houston, TX 782341063507101
Common questions
What is Maria S. Rayas, MD's NPI number?
Maria S. Rayas, MD's National Provider Identifier (NPI) is 1457536328, issued on Jan 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Maria S. Rayas, MD located?
The NPPES record lists a practice address at 4502 Medical Dr, San Antonio, TX, 78229. Phone: (210) 358-2015. Providers update this record themselves, so call before visiting.
How can I verify Maria S. Rayas, MD's license?
NPPES lists Texas license number N6606, 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 Maria S. Rayas, MD prescribe under Medicare Part D?
In 2024, Maria S. Rayas, MD had 65 Medicare Part D claims; the average among pediatric endocrinology physician prescribers was 105. 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.