{
 "id": "mcd:4723da0d-4d04-46ce-8163-e4b58c8fe728",
 "slug": "separate-chip-enrollment-by-month-and-state",
 "source": "data.medicaid.gov",
 "title": "Separate CHIP Enrollment by Month and State",
 "summary": "This dataset includes total enrollment in separate CHIP (S-CHIP) programs by month and state from April 2023 forward.",
 "description": "This dataset includes total enrollment in separate CHIP (S-CHIP) programs by month and state from April 2023 forward. Sources: T-MSIS Analytic Files (TAF) and state-submitted enrollment totals. The data notes indicate when a state’s monthly total was a state-submitted value, rather than from T-MSIS. Methods: Enrollment includes individuals enrolled in S-CHIP at any point during the coverage month, excluding those enrolled in dental-only coverage. The S-CHIP enrollment in this report also excludes enrollees covered by Medicaid expansion CHIP, a program in which a state receives federal funding to expand Medicaid eligibility to optional targeted low-income children that meets the requirements of section 2103 of the Social Security Act. If an individual is enrolled in both Medicaid or Medicaid-expansion CHIP and S-CHIP in a given month, TAF picks the program in which they were last enrolled. Unless S-CHIP enrollment counts are replaced with a state-submitted value, each state's monthly S-CHIP enrollment is equal to the number of unique people in TAF with a CHIP_CODE = 3 (S-CHIP) and ELGBLTY_GRP_CD not equal to ‘66’ (Children Eligible for Dental Only Supplemental Coverage). More information about TAF is available at https://www.medicaid.gov/medicaid/data-systems/macbis/medicaid-chip-research-files/transformed-medicaid-statistical-information-system-t-msis-analytic-files-taf/index.html . Note: A historic dataset with S-CHIP enrollment by month and state from April 2023 to June 2024 is also available at: https://data.medicaid.gov/dataset/d30cfc7c-4b32-4df1-b2bf-e0a850befd77 . This historic dataset was created to fulfill reporting requirements under section 1902(tt)(1) of the Social Security Act, which was added by section 5131(b) of subtitle D of title V of division FF of the Consolidated Appropriations Act, 2023 (P.L. 117-328) (CAA, 2023). Please note that the methods used to count S-CHIP enrollees differ slightly between the two datasets; as a result, data users should exercise caution if comparing S-CHIP enrollment across the two datasets. State notes: Alaska, District of Columbia, Hawaii, New Hampshire, New Mexico, North Carolina, North Dakota, Ohio, South Carolina, Vermont, and Wyoming do not have S-CHIP programs. Maryland has an S-CHIP program for the from conception to end of pregnancy group that began in July 2023; April 2023 - June 2023 data for Maryland represents retroactive coverage. Oregon moved all its S-CHIP enrollees, other than those in the from conception to the end of pregnancy group, to a Medicaid-expansion CHIP program effective January 1, 2024. CHIP: Children's Health Insurance Program",
 "aliases": [],
 "keywords": [
  "Child Enrollment",
  "Eligibility Determinations",
  "Applications",
  "Children's Health Insurance Program (CHIP)",
  "Program Enrollment"
 ],
 "themes": [
  "Enrollment"
 ],
 "topics": [
  "medicaid-chip"
 ],
 "category": "Enrollment",
 "publisher": "Centers for Medicare & Medicaid Services (CMS), data.medicaid.gov",
 "contact": "Medicaid.gov@cms.hhs.gov",
 "landing_url": "https://data.medicaid.gov/dataset/4723da0d-4d04-46ce-8163-e4b58c8fe728",
 "csv_url": "https://download.medicaid.gov/data/current-chip-caa-reporting-metrics-september-2026-release.csv",
 "api_url": "https://data.medicaid.gov/api/1/datastore/query/4723da0d-4d04-46ce-8163-e4b58c8fe728/0",
 "api_kind": "dkan-datastore",
 "preview_url": null,
 "dictionary_url": "https://data.medicaid.gov/api/1/metastore/schemas/data-dictionary/items/d0406ae8-8b19-4108-8f1b-e14a46b0f810",
 "dictionary_kind": "tableschema",
 "methodology_urls": [],
 "state_column": "state_abbreviation",
 "row_count": 1440,
 "posted": "2026-09-25",
 "modified": "2026-09-25",
 "period_start": null,
 "period_end": null,
 "latest_period": null,
 "cadence": "quarterly",
 "next_update": null,
 "versions": [],
 "columns": [
  {
   "name": "state_abbreviation",
   "label": "State Abbreviation",
   "type": "string",
   "meaning": "State abbreviation.",
   "source": "medicaid-dictionary"
  },
  {
   "name": "coverage_month",
   "label": "Coverage Month",
   "type": "integer",
   "meaning": "The month of coverage in a separate CHIP program (S-CHIP).",
   "source": "medicaid-dictionary"
  },
  {
   "name": "tmsis_data_through_month",
   "label": "T-MSIS Data Through Month",
   "type": "text",
   "meaning": null,
   "source": "dkan-schema"
  },
  {
   "name": "schip_enrollment",
   "label": "S-CHIP Enrollment",
   "type": "int",
   "meaning": null,
   "source": "dkan-schema"
  },
  {
   "name": "data_notes",
   "label": "Data notes",
   "type": "string",
   "meaning": "Data notes. In T-MSIS, states submit a CHIP Code and an Eligibility Group for each enrollee. The CHIP Code indicates whether the individual is enrolled in Medicaid, Medicaid-expansion CHIP, or S-CHIP. The Eligibility Group indicates the specific eligibility pathway that is applicable to the individual based on the state’s eligibility determination process. Certain Eligibility Groups (codes 61-68) should only be used for S-CHIP enrollees. If more than 5% of the S-CHIP enrollees in TAF have a missing Eligibility Group or an Eligibility Group not associated with S-CHIP, the following data note is applied: “S-CHIP enrollment may be inaccurate due to misalignment between Medicaid/CHIP classification and eligibility groups.” More information is available at https://www.medicaid.gov/medicaid/eligibility-policy/index.html, https://www.medicaid.gov/chip/chip-eligibility-enrollment/index.html, and https://www.medicaid.gov/tmsis/dataguide/data-elements/elg005087/.",
   "source": "medicaid-dictionary"
  }
 ],
 "caveats": [],
 "curated": false,
 "license": "https://www.usa.gov/publicdomain/label/1.0/",
 "detail_key": "4723da0d-4d04-46ce-8163-e4b58c8fe728|2026-09-25T18:00:00+00:00|https://download.medicaid.gov/data/current-chip-caa-reporting-metrics-september-2026-release.csv",
 "checked": "2026-10-25",
 "source_name": "data.medicaid.gov"
}