Maria Rayas, MD

UT Health San Antonio
Pediatric Endocrinology
Board Affiliation/Certification
American Board of Pediatric Endocrinology
American Board of Pediatrics
University of Texas Health Science Center at San Antonio, 2007
University of Texas Health Science Center, 2010
Christus Santa Rosa Residency Program, 2013
University of Texas Health Science Center, 2013
Insurance Accepted
6 Degrees - Transplant
90 Degree Benefits - Commercial
Aetna - Commercial Exchange
Aetna - PPO/EPO/HMO/MC Advantage
Aetna - Smart Care EPO
Aetna - Transplant
Aetna Better Health - Medicaid-CHIP
Aetna Better Health - Medicaid-STAR
Amerigroup (Gonzaba) - Medicare Advantage (Transplants only)
Amerigroup - Medicaid-CHIP
Amerigroup - Medicaid-CHIP Perinate
Amerigroup - Medicaid-STAR
Amerigroup - Medicaid-STAR Kids
Amerigroup - Medicaid-STAR PLUS
Amerigroup - Medicare Advantage
Amerigroup - Medicare-Medicaid Duals
Ancira Enterprises - Direct Employer
Blue Cross Blue Shield of Texas - Exchange (BlueAdvantage)
Blue Cross Blue Shield of Texas - HMO/PPO
Blue Cross Blue Shield of Texas - HPN/EPO (Narrow Network)
Blue Cross Blue Shield of Texas - Medicaid-STAR
Blue Cross Blue Shield of Texas - Medicare Advantage HMO
Blue Cross Blue Shield of Texas - Medicare Advantage PPO
Blue Cross Blue Shield of Texas - Narrow HMO (Blue Essentials)
Blue Cross Blue Shield of Texas - Narrow HMO (Blue Premier)
Blue Cross Blue Shield of Texas - Traditional
Blue Cross Blue Shield of Texas - Transplant Programs
Care Improvement Plus - Medicare Advantage-SNP
Cenpatico - Medicaid-CHIP
Cenpatico - Medicaid-STAR
Cenpatico - Medicaid-STAR Health (Foster Care)
Cenpatico - Medicare Advantage
Cigna (USSA Client Only) - Direct Employer
Community First Health Plans - HMO/Exchange (EPO)
Community First Health Plans - Medicaid-CHIP
Community First Health Plans - Medicaid-CHIP Perinate
Community First Health Plans - Medicaid-STAR
Community First Health Plans - Medicaid-STAR Kids
Community First Health Plans - Medicare Advantage HMO
Coventry - HMO/PPO
Coventry - Work Comp / Auto
Driscoll Health Plan - Medicaid-All
El Paso First - Medicaid-CHIP
El Paso First - Medicaid-STAR
Entrust - TPA
First Health - Commercial PPO
FirstCare (Part of Scott & White Health Plans) - Medicaid-STAR
Gonzaba Medical Group - Transplant ONLY
Healthsmart - Accel
Healthsmart - Commercial PPO
Healthsmart - HPO/POS
Humana - Commercial Behavioral Health
Humana - Exchange (HMOx)
Humana - HMO/PPO/Behavioral Health
Humana - Medicare Advantage Behavioral Health
Humana - Medicare Advantage HMO (Gold)
Humana - Medicare Advantage PPO
Humana - National Transplant ONLY Network
Humana Military - TRICARE
Imperial Health Plan - Medicare Advantage
Independent Medical Systems (IMS) - PPO
Interlink - Transplant
LifeTrac - Transplant
Magellan - Commercial and Medicaid Behavioral Health
Molina - Commercial Exchange
Molina - Medicaid-CHIP
Molina - Medicaid-CHIP Perinate
Molina - Medicaid-STAR
Molina - Medicare Advantage
Molina - Medicare-Medicaid Duals
OptumHealth - Transplant ONLY
Oscar - Commercial Exchange
Point Comfort Underwriters (PCU) - Refugee Medical Assistance
Point Comfort Underwriters (PCU) - Unaccompanied Children
Prime Health Services - Commercial PPO
Prime Health Services - Medicare Advantage
ProCare Advantage - Medicare Advantage I-SNP
Provider Network of America (PNOA) - Commercial
Provider Partners Health Plan (PPHP) - Medicare Advantage I-SNP
Scott & White Health Plan - HMO/PPO/Medicare Advantage
Superior HealthPlan - Medicaid-CHIP
Superior HealthPlan - Medicaid-CHIP Perinate
Superior HealthPlan - Medicaid-STAR
Superior HealthPlan - Medicaid-STAR Health (Foster Care)
Superior HealthPlan - Medicaid-STAR Kids
Superior HealthPlan - Medicaid-STAR PLUS
Superior HealthPlan - Medicare Advantage (Allwell)
Superior HealthPlan - Medicare-Medicaid Duals (Allwell)
Texas Independence Health Plan - Medicare Advantage I-SNP
Three Rivers Provider Network - PPO
Tokio Marine - Transplant
TriWest (via BCBSTX) - VA CCN Program
UnitedHealthcare - Medicaid-STAR
UnitedHealthcare - Medicaid-STAR Kids
UnitedHealthcare - Medicaid-STAR PLUS
UnitedHealthcare - Medicare Advantage
UnitedHealthcare - PPO
Universal Benefits Consortium - Brokerage Firm (School Districts)
University of Incarnate Word (Gilsbar) - Direct Employer
WellCare - Medicare Advantage
WellMed - Medicare Advantage
WellPoint (Gonzaba) - Medicare Advantage (TRANSPLANTS ONLY)
WellPoint - Medicaid-CHIP
WellPoint - Medicaid-CHIP Perinate
WellPoint - Medicaid-STAR
WellPoint - Medicaid-STAR Kids
WellPoint - Medicaid-STAR PLUS
WellPoint - Medicare Advantage
WellPoint - Medicare-Medicaid Duals
Please contact your health insurance company to confirm provider participation. For billing and insurance questions, please call our Billing Department at 210-358-3260.
I’m a pediatric endocrinologist at University Health and an assistant professor in the division of pediatric endocrinology and diabetes at UT Health San Antonio.
My interests include learning about cystic fibrosis-related diabetes (CFRD) and other CF endocrine related disorders. The majority of my research and presentations have focused on improving the screening, diagnosis and management of CFRD.
For the past seven years, I have helped develop a multidisciplinary clinic for CFRD patients in the CF Center with the CF Center director and staff. I’m the endocrinologist dedicated to seeing the adult CF patients with endocrine disorders. I have a KL2 research grant and a multi-center research grant that collaborates in recruiting and treatment of patients with CF-related diabetes issues.
Research Interests:
  • Continuous glucose monitoring in Type 1 diabetes and cystic fibrosis patients
  • Cystic fibrosis-related diabetes screening, diagnosis and treatment


  1. Lynch JL, Willey-Courand DB, Rayas MS, Guajardo JR. Screening for Cystic Fibrosis-Related Diabetes by an Integrated Care Team Using an Algorithm; 2011 Jan. (Pediatric Pulmonology).

Book Chapters

  1. TODAY Study Group, & Bjornstad Petter El ghormli Laure Hughan Kara S. Laffel Lori M. Nadeau Kristen J. Rayas Maria Tesfaldet Bereket Tollefsen Sherida E. Willi Steven M. Lynch Jane. (2022). Effects of metabolic factors, race-ethnicity, and sex on the development of nephropathy in adolescents and young adults with type 2 diabetes: results from the TODAY Study. Diabetes Care, 45(5), 1056-1064.
  2. Orsi C, Rayas M, Escaname E, Hutchins, J. Chapter 8: Pediatric Type 2 Diabetes Mellitus. In: Orsi CM; Rayas MS; Escaname EN, Hutchins J. Recent Advances in Pediatric Medicine Synopsis of General Pediatric Practice. 2017. p. 105-116.

Journal Articles

  1. Arslanian S, El Ghormli L, Haymond MH, Chan CL, Chernausek SD, Gandica RG, Gubitosi-Klug R, Levitsky LL, Siska M, Willi SM; TODAY Study Group. (J Lynch, E Escaname, M Rayas) . Beta cell function and insulin sensitivity in obese youth with maturity onset diabetes of youth mutations vs type 2 diabetes in TODAY: Longitudinal observations and glycemic failure. Pediatr Diabetes. 2020 Jun;21(4):575-585. doi: 10.1111/pedi.12998. Epub 2020 Mar 3. PMID: 32064729.
  2. Kaar JL, Schmiege SJ, Drews K, Higgins J, Walders-Abramson N, Isganaitis E, Willi SM, Marcus MD, Zeitler PS, Kelsey MM. Evaluation of the longitudinal change in health behavior profiles across treatment groups in the TODAY clinical trial. (J Lynch, E Escaname, M Rayas) Pediatr Diabetes. 2020 Mar;21(2):224-232. doi: 10.1111/pedi.12976 PMID: 31886931.
  3. Shah R, McKay SV, Levitt Katz LE, El Ghormli L, Anderson BJ, Casey TL, Higgins L, Izquierdo R, Wauters AD, Chang N; TODAY Study Group.(J Lynch, E Escaname, M Rayas) . Adherence to multiple medications in the TODAY (Treatment Options for type 2 Diabetes in Adolescents and Youth) cohort: effect of additional medications on adherence to primary diabetes medication. J Pediatr Endocrinol Metab. 2020 Feb 25;33(2):191-198. doi: 10.1515/jpem-2019-0315. PMID: 31809265.
  4. Rayas MS, Kelly A, Hughan KS, Daley T, Zangen D. Adrenal Function in Cystic Fibrosis J Cyst Fibros 2019 Oct;18:S74-S81.
  5. Block JP, Bailey LC, Gillman MW, Lunsford D, Daley MF, Eneli I, Finkelstein J, Heerman W, Horgan CE, Hsia DS, Jay M, Rao G, Reynolds JS, Rifas-Shiman SL, Sturtevant JL, Toh S, Trasande L, Young J, Forrest CB, Rayas MS. PCORnet Antibiotics and Childhood Growth Study Group. Early Antibiotic Exposure and Weight Outcomes in Young Children Pediatrics 2019 Jan.
  6. Daley Jean Pierre, Tangpricha Vin, Kelly A, Rayas MS, Hughan Kara. Vitamin D deficiency and its Treatment in Cystic Fibrosis Journal of Cystic Fibrosis 2019 Oct; 18:S66-S73.
  7. Klingensmith GJ, Lanzinger S, Tamborlane WV, Hofer S, Cheng P, deBeaufort C, Gal RL, Reinehr T, Kollman C, Holl R. PDC Consortium: Lynch JL, Orsi CM, Rayas MS, Barajas R. Adolescent Type 2 Diabetes: Comparing the Pediatric Diabetes Consortium and Germany/Austria/Luxemburg Pediatric Diabetes Prospective Registries Pediatr Diabetes 2018 Nov;19(7):1156-1163.
  8. Block JP, Bailey LC, Gillman MW, Lunsford D, Boone-Heinonen J, Cleveland LP, Finkelstein J, Horgan C, Jay M, Reynolds JS, Sturtevant J, Forrest CB. PCORnet Antibiotics Childhood Growth Study Group Tirado-Ramos A, Rayas M. PCORnet Antibiotics and Childhood Growth Study: Process for Cohort Creation and Cohort Description Acad Pediatr 2018 Jul;18(5):569-576.

Other Publications

  1. Castellanos LE, Russell SJ, Damiano ER, Beck RW, Shah VN, Bailey R, Calhoun P, Bird K, Mauras N; Bionic Pancreas Research Group. The Insulin-Only Bionic Pancreas Improves Glycemic Control in Non-Hispanic White and Minority Adults and Children With Type 1 Diabetes. Diabetes Care. 2023 Mar 31:dc221478. doi: 10.2337/dc22-1478. PMID: 37000680.
  2. Mauras N, Damiano ER, El-Khatib FH, Marak MC, Calhoun P, Ruedy KJ, Balliro C, Li Z, Beck RW, Russell SJ. Utility and Safety of Backup Insulin Regimens Generated by the Bionic Pancreas: A Randomized Study. Diabetes Technol Ther. 2023 Mar 22. doi: 10.1089/dia.2022.0461. PMID: 36877259.
  3. VAVRINA, K., PILLAI, R., & RAYAS, M. S. (2023). 1110-P: Role of Ethnicity in Weight Gain after 12 Months of Exacaftor/Tezacaftor/Ivacaftor in Children with Cystic Fibrosis. Diabetes, 72(Supplement_1).
  4. Beck RW, Russell SJ, Damiano ER, El-Khatib FH, Ruedy KJ, Balliro C, Li Z, Calhoun P. A Multicenter Randomized Trial Evaluating Fast-Acting Insulin Aspart in the Bionic Pancreas in Adults with Type 1 Diabetes. Diabetes Technol Ther. 2022 Oct;24(10):681-696. doi: 10.1089/dia.2022.0167. PMID: 36173235; PMCID: PMC9529301.
  5. Messer LH, Buckingham BA, Cogen F, Daniels M, Forlenza G, Jafri RZ, Mauras N, Muir A, Wadwa RP, White PC, Russell SJ, Damiano ER, El-Khatib FH, Ruedy KJ, Balliro CA, Li Z, Marak MC, Calhoun P, Beck RW. Positive Impact of the Bionic Pancreas on Diabetes Control in Youth 6-17 Years Old with Type 1 Diabetes: A Multicenter Randomized Trial. Diabetes Technol Ther. 2022 Oct;24(10):712-725. doi: 10.1089/ PMID: 36173237; PMCID: PMC9529304.
  6. Lynch J, Kanapka LG, Russell SJ, Damiano ER, El-Khatib FH, Ruedy KJ, Balliro C, Calhoun P, Beck RW.The Insulin-Only Bionic Pancreas Pivotal Trial Extension Study: A Multi-Center Single-Arm Evaluation of the Insulin-Only Configuration of the Bionic Pancreas in Adults and Youth with Type 1 Diabetes. Diabetes Technol Ther. 2022 Oct;24(10):726-736. doi: 10.1089/dia.2022.0341. PMID: 36173238; PMCID: PMC9529297.
  7. Bionic Pancreas Research Group, Multicenter, Randomized Trial of a Bionic Pancreas in Type 1 Diabetes. N Engl J Med. 2022 Sep 29;387(13):1161-1172. doi: 10.1056/NEJMoa2205225. PMID: 36170500.
  8. He, S., Ryu, J., Liu, J., Luo, H., Lv, Y., Langlais, P. R., ... & Dong, L. Q. (2021). LRG1 is an adipokine that mediates obesity-induced hepatosteatosis and insulin resistance. The Journal of clinical investigation, 131(24).
  9. Nadeau, K. J., Arslanian, S., Bacha, F., Caprio, S., Chan, C., Chao, L. C., ... & TODAY Study Group. Effect of Early Glycemic Control in Youth-Onset Type 2 Diabetes on Longer-Term Glycemic Control and β-Cell Function: Results From the TODAY Study. Diabetes Care.
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