National Average Drug Acquisition Cost

NADAC

pharmacy

Updated 5/15/2026

Definition

A CMS benchmark representing the average price pharmacies pay to acquire drugs from wholesalers based on invoice data voluntarily submitted by pharmacies. NADAC is used as a drug pricing reference in Medicaid fee-for-service reimbursement and pharmacy network contract negotiations.

Standard Abbreviation

NADAC

Database Usage

-- Example column naming
CREATE TABLE claims (
  clm_id VARCHAR(50),
  nadac NUMBER(12,2),  -- National Average Drug Acquisition Cost (precision 12, scale 2)
  ...
);

-- Example in SELECT
SELECT
  clm_id,
  nadac as national_average_drug_acquisition_cost
FROM claims;

Example database column name

ISO-11179 snake_case standard

-- Recommended column name
nadac

-- Example DDL
CREATE TABLE healthcare_data (
  record_id   VARCHAR(50)   NOT NULL,
  nadac        NUMBER(12,2),  -- National Average Drug Acquisition Cost (precision 12, scale 2)
  created_dt  TIMESTAMP     NOT NULL DEFAULT NOW()
);

Column names follow the ISO-11179 naming convention: lowercase, underscore-separated, using the standard abbreviation as a prefix where applicable.

Why This Term Matters

Pharmacy data is among the most regulated and codified data in healthcare, governing controlled substances, PBM adjudication, and Medicare Part D reporting. A data engineer fluent in pharmacy terminology builds pipelines that correctly parse NDC codes, validate DEA numbers, and detect drug utilization anomalies before they reach compliance teams. Errors in pharmacy field definitions frequently trigger PBM contract disputes and CMS audit findings.

Common uses in healthcare data

PBM claims adjudication and drug utilization review
Controlled substance monitoring and DEA compliance
Pharmacy data warehouse and ETL pipeline design
Prior authorization and step therapy workflows
Medicare Part D reporting and CMS submissions
PBM feed normalization in Snowflake pharmacy claims fact tables
Epic Willow and Cerner Pharmacy integration data mapping and reconciliation
Databricks streaming pipeline for real-time drug utilization monitoring and alerting

Related Healthcare Standards

NCPDP SCRIPT

The ANSI-accredited standard for electronic prescribing and pharmacy transactions, defining data fields and message formats used by PBMs and pharmacies.

NDC (FDA)

The National Drug Code — the FDA's universal product identifier for drugs, used in all pharmacy claims, dispensing records, and formulary data.

DEA Controlled Substance Regulations (21 CFR)

Governs controlled substance prescribing, dispensing, and reporting requirements, including DEA number format and Schedule classification.

Data Quality Considerations

NDC codes arrive in multiple formats (5-4-2 segmented, 11-digit flat, with or without dashes) — normalize to 11-digit no-dash format at ingestion to prevent duplicate drug records in Snowflake or Databricks.
DEA number check-digit validation (using the standard DEA checksum algorithm) catches a significant share of data entry errors before they reach claim submission — implement this as a mandatory ETL quality gate.
Days supply values from PBM feeds frequently contain outliers (e.g., 999 for unlimited supply) — cap at clinically valid maximums per drug class and flag for pharmacy analytics review downstream.

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