Chima D Ndumele, MPH, PhD
Department Chair and Professor of Public Health (Health Policy) and Professor in the Institution for Social and Policy StudiesDownloadHi-Res Photo
Cards
Contact Info
About
Copy Link
Titles
Department Chair and Professor of Public Health (Health Policy) and Professor in the Institution for Social and Policy Studies
Biography
Chima Ndumele is an Associate Professor of Public Health (Health Policy) at the Yale School of Public Health. His research is focused on better understanding factors which influence the way vulnerable populations connect with and access health care resources. Specifically, he conducts work in three areas. The first examines how changes in local policy environment impact the care received by Medicaid enrollees. The second area explores how safety-net organizations can improve health care services delivery. Finally, he investigates the effects of changes in insurance coverage on the quality of care received by individuals with chronic physical and mental health conditions. He received his PhD from the Brown University School of Public Health
Last Updated on June 02, 2025.
Appointments
Health Policy & Management
ChairDualHealth Policy & Management
ProfessorPrimaryInstitution for Social and Policy Studies
ProfessorSecondary
Other Departments & Organizations
Education & Training
- PhD
- Brown University (2013)
Research
Copy Link
Overview
Public Health Interests
Chronic Diseases; Community Health; Health Equity, Disparities, Social Determinants and Justice; Health Care Management; Health Policy
ORCID
0000-0002-4887-0043
Research at a Glance
Yale Co-Authors
Frequent collaborators of Chima D Ndumele's published research.
Publications Timeline
A big-picture view of Chima D Ndumele's research output by year.
Jacob Wallace, PhD
Harlan Krumholz, MD, SM
Yuan Lu, ScD
Mark Schlesinger, PhD
Rohan Khera, MD, MS
Susan Busch, PhD
18Publications
229Citations
Publications
2026
The Private Provision of Public Services: Evidence from Random Assignment in Medicaid
Agafiev Macambira D, Geruso M, Lollo A, Ndumele C, Wallace J. The Private Provision of Public Services: Evidence from Random Assignment in Medicaid. American Economic Review 2026, 116: 2038-2084. DOI: 10.1257/aer.20230541.Peer-Reviewed Original ResearchAltmetricConceptsPrivate provisionSocial health insurancePrivate provision of public servicesFee-for-service systemLower-cost drugsProvision of public servicesPrivate managed careNatural experimentHealth insurancePrescription drugsUtilization managementRandom assignmentManaged CarePublic servicesMedicaidHealth care qualityPriceInsuranceOutpatient servicesEnrolleesConsumer satisfactionMedical benefitsSavingsConsumersEvidenceVariation in time to payment in Medicaid managed care: evidence from national TAF data, 2022
Zhu J, Meath T, Moreau N, McConnell K, Busch S, Ndumele C. Variation in time to payment in Medicaid managed care: evidence from national TAF data, 2022. Health Affairs Scholar 2026, 4: qxag102. PMID: 42158222, PMCID: PMC13182904, DOI: 10.1093/haschl/qxag102.Peer-Reviewed Original ResearchConceptsTransformed Medicaid Statistical Information SystemState-level differencesDistrict of ColumbiaPayment distributionMedicaid MCOsStatistical Information SystemMedicaid Statistical Information SystemAdministrative burdenTime paymentsService inclusionNational evidenceCare networkMedicaid claimsProfessional claimsClaimsFixed-effects modelCash flowPayment timeMedicaidPaymentService typesProvider participationProvider billingVariation In Medicaid And Medicare Payment Rates To Community Health Centers, 2023
Markowski J, Vandenbroeck A, Ndumele C. Variation In Medicaid And Medicare Payment Rates To Community Health Centers, 2023. Health Affairs 2026, 45: 413-422. PMID: 41941685, DOI: 10.1377/hlthaff.2025.00949.Peer-Reviewed Original ResearchAltmetricMeSH Keywords and ConceptsConceptsCommunity health centersProspective payment systemPayment ratesHealth centersHealth care safety netMedicare payment ratesNon-Hispanic blacksPublic insurance payersCost of careFinancial stabilityPredicted paymentsUnderserved communitiesChronic conditionsPayment systemSafety netInsurance payerMedicareMedicaidPaymentStandard policyLimited resourcesEquityCommunityGrowing demandCare
2025
Medicaid: Increased Patient Access To MOUD In Residential Treatment Associated With Facility Openings And Closures, 2012–22
Beetham T, Newton H, Ndumele C, Fiellin D, Busch S. Medicaid: Increased Patient Access To MOUD In Residential Treatment Associated With Facility Openings And Closures, 2012–22. Health Affairs 2025, 44: 1122-1130. PMID: 40893069, PMCID: PMC12809527, DOI: 10.1377/hlthaff.2025.00348.Peer-Reviewed Original ResearchCitationsAltmetricMeSH Keywords and ConceptsConceptsMedicaid patients' accessDifference-in-differences frameworkResidential addiction treatmentIntervention statesResidential addiction treatment facilityMOUD availabilityPolicy effectsProvider entrySurvey dataMedicaid fundingMedicaid participationMedicaid beneficiariesPolicyAddiction treatment facilitiesMedicaidTreatment marketAddiction treatmentWaiverOpioid use disorderMedicaid patientsMOUDUse disorderStateFacility entryBeneficiariesHospitalization and Credit Scores Among Medicaid Beneficiaries in Louisiana
Walker B, Compta G, Siebert A, Anderson A, Callison K, Ndumele C, Wallace J. Hospitalization and Credit Scores Among Medicaid Beneficiaries in Louisiana. JAMA Health Forum 2025, 6: e251570. PMID: 40478557, PMCID: PMC12144616, DOI: 10.1001/jamahealthforum.2025.1570.Peer-Reviewed Original ResearchAltmetricSNAP Work Requirements Reversal and Program Enrollment
Factor H, Wallace J, Lavallee M, Lollo A, Ndumele C. SNAP Work Requirements Reversal and Program Enrollment. JAMA Health Forum 2025, 6: e251587. PMID: 40445600, PMCID: PMC12125636, DOI: 10.1001/jamahealthforum.2025.1587.Peer-Reviewed Original ResearchAltmetricSupplemental Nutrition Assistance Program Work Requirements and Safety-Net Program Participation
Ndumele C, Factor H, Lavallee M, Lollo A, Wallace J. Supplemental Nutrition Assistance Program Work Requirements and Safety-Net Program Participation. JAMA Internal Medicine 2025, 185: 92-100. PMID: 39495527, PMCID: PMC11536301, DOI: 10.1001/jamainternmed.2024.5932.Peer-Reviewed Original ResearchCitationsAltmetricConceptsSupplemental Nutrition Assistance ProgramSNAP work requirementsAble-bodied adultsChronic conditionsCharacteristics of individualsLow-incomeCohort studyMedicaid coverageNutrition Assistance ProgramSocioeconomic characteristics of individualsProportion of enrolleesChronic illnessMain OutcomesProgram enrollmentMedicaid enrolleesYounger beneficiariesSocioeconomic characteristicsMedicaidStatistically significant changesTarget populationEnrolleesAssistance programsCaregiversSafety-net programsBeneficiariesAttributing Racial Differences in Care to Health Plan Performance or Selection
Wallace J, Ndumele C, Lollo A, Macambira D, Lavallee M, Green B, Duchowny K, McWilliams J. Attributing Racial Differences in Care to Health Plan Performance or Selection. JAMA Internal Medicine 2025, 185: 61-72. PMID: 39585673, PMCID: PMC11589859, DOI: 10.1001/jamainternmed.2024.5451.Peer-Reviewed Original ResearchCitationsAltmetricConceptsEmergency department visitsPrimary care visitsCross-sectional studyDepartment visitsCare visitsRacial differencesWhite enrolleesMagnitude of racial differencesHealth equity metricHealth care disparitiesWhite Medicaid enrolleesSelection biasSouthern US statesPlanning indicatorsPrescription drug useCare disparitiesSelf-identified blacksHealth plansMain OutcomesEffectiveness of planningPublic reportingAdministrative claimsRandom populationMedicaid populationMedicaid enrollees
2024
Racial and Ethnic Disparities in Age-Specific All-Cause Mortality During the COVID-19 Pandemic
Faust J, Renton B, Bongiovanni T, Chen A, Sheares K, Du C, Essien U, Fuentes-Afflick E, Haywood T, Khera R, King T, Li S, Lin Z, Lu Y, Marshall A, Ndumele C, Opara I, Loarte-Rodriguez T, Sawano M, Taparra K, Taylor H, Watson K, Yancy C, Krumholz H. Racial and Ethnic Disparities in Age-Specific All-Cause Mortality During the COVID-19 Pandemic. JAMA Network Open 2024, 7: e2438918. PMID: 39392630, PMCID: PMC11581672, DOI: 10.1001/jamanetworkopen.2024.38918.Peer-Reviewed Original ResearchCitationsAltmetricMeSH Keywords and ConceptsConceptsCOVID-19 public health emergencyNon-HispanicPublic health emergencyOther Pacific IslanderExcess mortalityAlaska NativesUS populationExcess deathsRates of excess mortalityCross-sectional study analyzed dataYears of potential lifeMortality relative riskNon-Hispanic whitesCross-sectional studyPacific IslandersStudy analyzed dataAll-Cause MortalityEthnic groupsMortality disparitiesMortality ratioTotal populationDeath certificatesEthnic disparitiesMain OutcomesDecedent ageAlternative Payment Models and Performance in Federally Qualified Health Centers
Markowski J, Wallace J, Schlesinger M, Ndumele C. Alternative Payment Models and Performance in Federally Qualified Health Centers. JAMA Internal Medicine 2024, 184: 1065-1073. PMID: 38976258, PMCID: PMC11231906, DOI: 10.1001/jamainternmed.2024.2754.Peer-Reviewed Original ResearchCitationsAltmetricConceptsPayment modelsMeasures of health care qualityPayer mixFederally Qualified Health CentersCohort studyValue-based payment modelsHealth care safety netColorectal cancer screeningHealth promotion modelHealth care qualityQualified health centersUniform Data SystemHealth outcome measuresAlternative payment modelsRisk profileFQHC patientsAssociated with clinicCare qualityChild BMIAdult BMICancer screeningState Medicaid programsIncentivizing qualityHealth centersRetrospective cohort study
News
Copy Link
News
- May 13, 2026
Above and Beyond: Honoring Faculty and Staff
- December 17, 2025
Medicaid reimbursement boosts access to opioid treatment at new facilities
- July 18, 2025
New Work Requirements for SNAP Benefits Could Hurt Families
- July 02, 2025Source: NPR
Hidden costs of Medicaid work requirements called 'astronomical'
Get In Touch
Copy Link
Contacts
Academic Office Number