ALABAMA DEPARTMENT OF MENTAL HEALTH AND MENTAL RETARDATION is effectively a single-payer Medicaid provider with Total Medicaid revenue of $85.5M and no Medicare billing on file; this indicates operations and reimbursement reliance are concentrated in state Medicaid programs rather than Medicare fee-for-service. The NPI was enumerated on 2007-01-19 (~19 years ago), showing a long-standing presence in the market that supports sustained Medicaid relationships and programmatic continuity. Revenue concentration is extreme: the top 3 Medicaid codes account for 87.3% of the provider's total Medicaid revenue, signaling a narrow set of service lines drive the vast majority of payments. H0020 is the dominant revenue driver, producing $64.7M (75.6% of Medicaid revenue) from methadone administration and related substance-use services; this code ranks #1 of 8 in-state and is described as notably above typical state volume, which identifies the provider as a statewide leader in methadone treatment delivery. The remaining top contributors are psychotherapy codes: 90837 ($7.5M, 8.8% of Medicaid revenue) and 90853 ($2.5M, 2.9% of Medicaid revenue), which together with H0020 form the precomputed top-3 share; the mix (individual long-session psychotherapy plus group therapy) suggests integrated outpatient behavioral health and substance use disorder treatment capacity. Multiple additional mental-health support and care-coordination codes (for example, H2027, G9008, 90791, H2011) appear with material volumes and high percentile ranks in-state, indicating a broad service offering beyond medication-assisted treatment that includes psychoeducation, care coordination, psychiatric evaluation, and crisis intervention. Competitive standing within Alabama is strong for several codes: the provider is at or near the 100th percentile for H0020, 90837, H0038, and H0031, and ranks in the top few providers statewide for other key codes, characterizing it as a dominant public behavioral health agency for specific service lines rather than a low-volume or marginal participant. Several service lines show routine volumes compared with peers (labels such as "typical, unremarkable volume" for codes like H2027 and G9008), which suggests while the provider dominates methadone services it also delivers a range of standard community behavioral health services consistent with peer norms.