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  3. /Medicare Part D Spending by Drug
CMSPrescription drugsUpdated 2026-06-14

Medicare Part D Spending by Drug

Per-drug Medicare Part D spending — total spend, claims, beneficiaries, dosage units, and year-over-year change by brand, generic, and manufacturer. Drug-keyed; no provider NPI. Source: Centers for Medicare & Medicaid Services · 2026-06-14

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14,309
drug × manufacturer rows
As of 2026-06-14
CMS · 2026-06-14
2023
Temporal coverage
Refreshed annual
CMS · 2026-06-14
MedicationKnowledge
FHIR resource
FHIR R4 · cms-part-d-spending/v1
Fonteum methodology

FHIR MedicationKnowledge · Sample record

What a record looks like in the API response.

Sample record
{
  "resourceType": "MedicationKnowledge",
  "id": "partd-example",
  "_source": "cms-part-d-spending-by-drug",
  "_methodology": "cms-part-d-spending/v1",
  "code": { "text": "Example Brand" },
  "extension": [{ "url": "totalSpending", "valueDecimal": 12500000 }]
}

Every record carries _source, _methodology, a snapshot date, and a confidence tier. All fourteen provenance fields survive export and API delivery.

cURL
curl -H "Authorization: Bearer $FONTEUM_KEY" \
  "https://api.fonteum.com/fhir/r4/MedicationKnowledge?_source=part-d-spending" \
  | jq '._source, ._methodology, .meta.tag'

Dataset facts

Dataset facts for Medicare Part D Spending by Drug
FieldValue
AgencyCenters for Medicare & Medicaid ServicesCMS · 2026-06-14
CategoryPrescription drugs
Records14,309 drug × manufacturer rowsCMS · 2026-06-14
Temporal coverage2023
Refresh cadenceAnnual
Freshness SLAWithin 7 days of annual CMS release
Last synced2026-06-14Updated 2026-06-14
FHIR resourceMedicationKnowledge
Methodologycms-part-d-spending/v1
MeasuredTotal spending, claims, beneficiaries, dosage units, and average spend per drug × manufacturer
Upstream sourcedata.cms.gov →

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How to reach this dataset.

API access is operator-approved during the pilot. Reviewed within one business day. No charge during the pilot period.

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FDA
FDA National Drug Code Directory →

FDA National Drug Code (NDC) Directory — product NDC, labeler, dosage form, and marketing category. Schema and provenance are live; the first ingest snapshot is pending, so this table currently holds 0 rows.

Browse all datasets →

Citations

  1. Centers for Medicare & Medicaid Services — Medicare Part D Spending by Drug (upstream source)
  2. Fonteum methodology (cms-part-d-spending/v1)
  3. Editorial & licensing policy

The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
12.5Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
4.7Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
33dataset pagesCitable, downloadable /data catalog pages
48reproducible studiesEach shipping the SQL behind its figures

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Reproducible by design

Every figure traces to its federal source.

14-tuple provenance

Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.

Reproducible SQL

Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.

Daily reconciliation

Published counts are reconciled against the upstream federal datasets on a daily cadence, with drift logged.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

Two doors

Use the free API and open data

Query providers, facilities, sanctions, and quality scores — each field carrying its federal source. Self-serve, no call to start.

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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

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