Does Humana Cover Rehab? Medicare Coverage, Day Limits, and 2026 MA Plan Changes
Humana covers drug and alcohol rehab — primarily through Medicare Advantage plans, which now represent Humana’s core business after the 2023–2024 exit from commercial group plans. Original Medicare (Part A) covers inpatient SUD treatment with a 2026 deductible of $1,676, $0 copay days 1–60, and coinsurance thereafter. Humana MA plans typically use day-based copays ($350/day days 1–5, then $0). Part D covers MAT medications.
This guide answers the four Medicare-focused questions searchers ask most — how many days Humana pays for rehab, does Medicare pay 100%, what kind of rehab Medicare covers, and the Medicare day count — and covers Humana’s 2023–2024 strategic pivot away from commercial insurance that most carrier coverage pages haven’t updated for.
Humana Is Now a Medicare-First Carrier
A critical context most coverage pages miss: Humana exited employer group commercial insurance in 2023–2024 to focus on Medicare Advantage. What this means for you:
- If you’re 65+ or on Medicare: Humana is a primary choice with 5+ million MA members
- If you’re a federal military family: Humana Military Healthcare administers TRICARE East
- If you have Humana Medicaid in select states: Coverage continues (CareSource partnership)
- If you had Humana commercial employer coverage: You likely transitioned to another carrier in 2023–2024
This pivot affects how to think about Humana for SUD treatment. The answers below focus on Medicare coverage because that’s where Humana now operates.
How Many Days Does Humana Pay for Rehab?
Under Humana Medicare Advantage plans, inpatient SUD follows a Medicare-aligned structure with simpler copays.
Humana Medicare Advantage Typical Structure
| Days in Inpatient | Typical Copay |
|---|---|
| Days 1–5 | $350/day typical (varies by plan) |
| Days 6–60 | $0/day |
| Days 61–90 | $0 (covered under Part A with MA cost-sharing) |
| Annual OOP max (federally capped) | $9,350 in 2026 |
Original Medicare (Part A) Structure — If You Don’t Have MA
| Days | Your Cost |
|---|---|
| Annual Part A deductible | $1,676 (2026) |
| Days 1–60 | $0 after deductible |
| Days 61–90 | $419/day coinsurance |
| Days 91+ (lifetime reserve, 60 total) | $838/day |
| After lifetime reserve used | 100% self-pay |
Key insight: Original Medicare has no out-of-pocket maximum. Humana MA plans cap at $9,350 — a significant financial protection. Alternatively, Humana Medicare Supplement (Medigap) plans with Original Medicare fill in deductible and coinsurance gaps.
No Lifetime Cap Under Parity Law
Under the ACA and Mental Health Parity Act, there is no lifetime limit on substance use disorder treatment. Each admission is authorized based on medical necessity (ASAM criteria). Multiple treatment episodes across a lifetime are covered — opioid and alcohol use disorders are chronic relapsing conditions.
Does Medicare Pay 100% for Rehab?
For most of the 90-day Part A benefit period, yes — after the deductible.
Original Medicare Math
- Annual Part A deductible: $1,676 (2026)
- Days 1–60: 100% covered (you pay $0)
- Days 61–90: Medicare pays everything except $419/day coinsurance (you pay)
- Days 91+: Lifetime reserve days with $838/day coinsurance (60 total across lifetime)
Most SUD inpatient stays are 28–60 days and fall entirely within the 100%-covered days 1–60 window — meaning your only cost is the $1,676 deductible.
Humana Medicare Advantage Math
Humana MA plans typically use copay structures instead of Part A deductible/coinsurance:
- Days 1–5: $350/day × 5 = $1,750
- Days 6+: $0/day
- Plus annual OOP max cap at $9,350
For a typical 30-day stay, MA members pay $1,750 total — comparable to Original Medicare’s $1,676 deductible.
Where the Gap Is
- Medicare doesn’t cover residential SUD treatment at all facilities — only Medicare-certified hospitals and SNFs. Many residential addiction treatment facilities are not Medicare-certified, creating access issues.
- Medicare’s SUD residential coverage is narrower than commercial insurance — some types of programs commercial plans cover aren’t reimbursed by Medicare.
- Psychiatric day limits under Original Medicare: 190-day lifetime limit on inpatient psychiatric hospital care (separate from SUD days in general hospitals).
Medigap Closes the Gap
Humana Medicare Supplement (Medigap) Plan G or Plan F covers the Part A deductible and Part A coinsurance, effectively giving you $0 out-of-pocket for inpatient SUD after paying the Medigap premium. This is a common combination for members who want maximum coverage.
What Kind of Rehab Does Medicare Cover?
Medicare covers both types of “rehab” — substance use disorder treatment AND post-surgical/injury physical rehabilitation. Most cost pages conflate these.
Substance Use Disorder Rehab (This Page)
Covered under Medicare Part A (inpatient hospital) and Part B (outpatient). Includes:
- Medical detoxification
- Inpatient residential at Medicare-certified facilities
- Partial hospitalization programs (PHP)
- Intensive outpatient programs (IOP)
- Standard outpatient individual and group therapy
- Medication-assisted treatment (MAT)
- Methadone treatment through certified OTPs (added as Medicare benefit in 2020)
Post-Surgical / Physical Rehabilitation (Different Benefit)
Covered under Medicare Part A (inpatient rehab facility, IRF) and Part B (outpatient PT/OT/speech). Includes:
- Inpatient rehab after stroke, knee replacement, hip replacement, spinal cord injury
- Skilled nursing facility (SNF) rehab stays
- Outpatient physical therapy, occupational therapy, speech therapy
These are unrelated to SUD treatment and follow different coverage rules.
For SUD-specific cost mechanics, see does insurance cover rehab and medical detox cost.
Humana Plan Types for SUD Coverage
Humana Medicare Advantage HMO (Gold Plus)
- Network: Regional, in-network only
- Referrals: May be required from PCP
- Out-of-network: Emergency stabilization only
- Typical inpatient cost share: $350/day days 1–5, then $0
- 2026 OOP max: Capped at $9,350 (federally mandated)
- Part D: Integrated for MAT medications
Best for members in HMO service areas with strong Humana MA networks.
Humana Medicare Advantage PPO
- Network: Broader; allows out-of-network at higher cost share
- Referrals: Not required
- Out-of-network: Covered at reduced reimbursement
- Typical inpatient cost share: $350/day days 1–5, then $0 in-network
- 2026 OOP max: Capped at $9,350
- Part D: Integrated
Best for members who want out-of-network flexibility or travel across state lines.
Humana Part D (Stand-Alone Prescription)
- Covers MAT medications for members with Original Medicare (not MA)
- Generic buprenorphine: $5–$40 typical
- Brand Suboxone: $30–$100
- Sublocade, Brixadi, Vivitrol: specialty tier with coinsurance
Humana Medicare Supplement (Medigap)
Fills Original Medicare gaps. Plan G (most common modern option) covers everything Medicare doesn’t except the Part B deductible.
- Part A deductible: covered
- Part A coinsurance (days 61+): covered
- Part B coinsurance: covered
- Lifetime reserve days: extended
Combined with Humana stand-alone Part D, this creates near-$0 SUD treatment cost for Medicare-eligible members.
Humana Medicaid (Select States)
- States: Florida, Kentucky (CareSource partnership), select others
- Coverage: Full SUD continuum at $0–$100 copay
- Network: In-network only
TRICARE East (Humana Military Healthcare)
- Members: Active-duty military, retirees, family members, some dependents
- Territory: 32 states east of the Mississippi plus Texas
- Active-duty cost: $0 for SUD treatment
- Retiree/family cost: Varies by TRICARE plan (Prime, Select, For Life)
Humana MAT Coverage
All FDA-approved MAT medications covered under Part D (for MA-integrated plans) or stand-alone Part D.
| Medication | Part D Tier | Typical MA Copay |
|---|---|---|
| Generic buprenorphine | Preferred generic | $5–$40 |
| Suboxone brand | Preferred brand | $30–$100 |
| Sublocade injection | Specialty | $50–$300 |
| Brixadi injection | Specialty | $50–$350 |
| Methadone (OTP) | Medical benefit | $50–$200 |
| Vivitrol injection | Specialty/Medical | $50–$250 |
| Acamprosate | Generic | $5–$30 |
| Disulfiram | Generic | $5–$30 |
The 2024 MHPAEA final rule and the 2023 X-waiver elimination have substantially reduced prior-authorization barriers for buprenorphine.
Humana Preauthorization Process
Authorization Timeline
- Urgent: 24–48 hours
- Standard: 3–5 business days
- Initial inpatient: 5–14 days
- Concurrent review: Every 3–7 days
Typical Days Authorized by Substance
| Condition | Typical Days |
|---|---|
| Alcohol use disorder | 14–28 |
| Opioid use disorder | 21–28 |
| Fentanyl use disorder | 28–45 |
| Benzodiazepine tapering | 28–45 |
| Stimulant use disorder | 7–21 |
| Co-occurring dual diagnosis | 30–60 |
Humana Behavioral Health
Humana’s behavioral health utilization review is managed through internal clinical teams. Medicare Advantage products have different review pathways than commercial products (remaining limited employer group plans or Medicaid).
Appeals
Internal Appeal
- Timeline: 60 days from denial for Medicare Advantage
- Response: 30 days standard, 72 hours urgent
- Process: Submit through Humana member services or provider
Medicare-Specific External Review
For MA denials: Office of Medicare Hearings and Appeals. For Medicaid: state fair hearing process. For commercial (legacy): Department of Labor or state insurance department.
For step-by-step appeal templates, see how to get insurance to cover rehab.
Verification Contact
Humana Member Services: 1-800-833-6917
Medicare/MA members: have your Humana member ID ready.
Ask These Questions
- Is [facility] a Medicare-certified SUD treatment provider in my plan’s network?
- What is my day 1–5 copay for inpatient SUD?
- What is my annual OOP max, and what’s met year-to-date?
- Is MAT (specifically [buprenorphine/methadone/Vivitrol]) on formulary?
- Is prior authorization required, and what’s the timeline?
Finding Medicare-Certified SUD Facilities
Not all residential addiction treatment facilities are Medicare-certified — this is the most common issue for Humana MA members. Before admission:
- Confirm the facility has a Medicare provider number
- Confirm it’s in Humana’s MA network
- Use SAMHSA’s treatment locator (filter for Medicare) at findtreatment.samhsa.gov
If no in-network Medicare-certified facility is available in your area, ask Humana about a single-case agreement.
If You’re Not Medicare-Eligible
If you’re under 65 and don’t qualify for Medicare, Humana is likely no longer an option after the 2023–2024 commercial exit. See:
- Does insurance cover rehab for alternatives
- How to get insurance to cover rehab
- Compare Aetna · Cigna · UnitedHealthcare · BCBS
Sources
- Humana. “Medicare Advantage Plans and Coverage.” 2026. https://www.humana.com/
- Centers for Medicare & Medicaid Services. “2026 Part A Deductible and Coinsurance.” 2025.
- CMS. “Medicare Coverage of Substance Use Disorder Services.” 2024. https://www.cms.gov/
- Humana. “Q4 2022 Earnings Call: Strategic Exit from Commercial Group Plans.” 2023.
- U.S. Department of Labor. “Mental Health Parity and Addiction Equity Act Final Rule (September 2024).” https://www.dol.gov/agencies/ebsa/laws-and-regulations/laws/mental-health-and-substance-use-disorder-parity
- TRICARE. “TRICARE East (Humana Military Healthcare).” 2026. https://www.tricare.mil/
- Healthcare.gov. “Mental Health and Substance Use Disorder Coverage.” 2026. https://www.healthcare.gov/coverage/mental-health-substance-abuse-coverage/
- SAMHSA Behavioral Health Treatment Services Locator. 2026. https://findtreatment.samhsa.gov/
Frequently Asked Questions
How many days does Humana pay for rehab?
Under Humana Medicare Advantage plans, inpatient SUD treatment follows Medicare Part A day structure: $0 copay for days 1–60 after the annual Part A deductible (~$1,676 in 2026), $419/day coinsurance for days 61–90, and $838/day for lifetime reserve days (60 total). Humana MA plans often replace this with simpler copay structures: typically $350/day for days 1–5, then $0 for remaining days through day 60. Skilled nursing facility benefits cover an additional 100 days per benefit period with copays after day 20. Under parity law, there's no lifetime limit on SUD treatment — each admission is authorized based on medical necessity.
Does Medicare pay 100% for rehab?
Medicare Part A pays 100% for inpatient SUD treatment for days 1–60 after you meet the annual deductible ($1,676 in 2026). Days 61–90 require daily coinsurance ($419/day in 2026). Lifetime reserve days (60 total across a lifetime) cost $838/day. Original Medicare does not have an annual out-of-pocket maximum, so these costs can add up. Humana Medicare Advantage plans replace this structure with copay schedules and have a 2026 OOP max capped at $9,350 — providing a financial ceiling Original Medicare lacks. Adding Humana Medicare Supplement (Medigap) to Original Medicare fills in the deductible and coinsurance gaps.
What kind of rehab does Medicare cover?
Medicare covers medically necessary substance use disorder treatment (drug and alcohol rehab) under Part A (inpatient hospital) and Part B (outpatient). Covered services: medical detox, inpatient residential at a participating facility, partial hospitalization (PHP), intensive outpatient (IOP), individual and group therapy, medication-assisted treatment (MAT), and methadone treatment through certified OTPs. Medicare also covers physical rehabilitation after surgery or injury — a separate benefit that's often confused with SUD rehab. Humana MA plans must cover everything Original Medicare covers; many MA plans add supplemental behavioral health benefits.
How many days does Medicare give you for rehab?
Medicare doesn't cap days for medically necessary SUD treatment — authorization continues as long as ASAM medical necessity criteria are met. Practical structure: Part A covers inpatient hospital/SNF stays in benefit periods (ends after 60 consecutive days out of hospital). Within each benefit period: days 1–60 covered 100% after deductible, days 61–90 require coinsurance, days 91–150 use lifetime reserve days. Most SUD inpatient stays are 28–60 days and fall well within the 90-day benefit period threshold. Humana MA plans may have initial authorization windows of 5–14 days with concurrent review, similar to commercial plans.
Does Humana Medicare Advantage cover drug rehab?
Yes. Humana MA plans cover the full continuum of SUD treatment: medical detox, residential inpatient, PHP, IOP, outpatient therapy, and MAT. MA plans must cover everything Original Medicare covers at minimum, and most Humana MA plans add supplemental benefits. Humana Gold Plus (HMO) plans require in-network facilities and referrals. Humana MA PPO plans offer out-of-network coverage at higher cost share. The 2026 MA annual out-of-pocket maximum is federally capped at $9,350 — a financial protection Original Medicare doesn't have.
What happened to Humana commercial plans in 2023-2024?
Humana announced in early 2023 it was exiting the employer group commercial insurance market to focus on Medicare Advantage. Commercial group plans were transitioned or sold to other carriers through 2023–2024. Humana retained: Medicare Advantage (its core business with 5+ million members), Part D stand-alone, Medicare Supplement, select state Medicaid managed care (CareSource partnership), and TRICARE East (military healthcare via Humana Military Healthcare). If you had Humana commercial group coverage, you likely transitioned to another carrier during 2023–2024. Most current Humana members are Medicare-eligible (65+ or qualifying disability).
Does Humana cover medication-assisted treatment (MAT)?
Yes, through Part D (for MA plans with integrated drug coverage) or stand-alone Part D plans. Covered MAT medications with typical MA copays: generic buprenorphine $5–$40, Suboxone brand $30–$100, Sublocade specialty $50–$300, Brixadi specialty $50–$350, methadone (via certified OTP — billed as medical benefit) $50–$200, Vivitrol injection (medical benefit) $50–$250, acamprosate and disulfiram typically $5–$30. MAT prior authorization has been reduced since the 2024 MHPAEA final rule and the 2023 X-waiver elimination, which made any DEA-registered prescriber eligible to prescribe buprenorphine.
Does Humana cover TRICARE / military rehab?
Humana Military Healthcare is the contractor for TRICARE East, serving active-duty service members, retirees, and military families in 32 states (east of the Mississippi plus Texas). TRICARE East covers comprehensive SUD treatment — detox, inpatient, PHP, IOP, outpatient, and MAT — with generally lower cost-sharing than commercial insurance. Active-duty service members typically pay $0 for SUD treatment. Retirees and family members have cost shares. TRICARE operates through authorized providers; Humana Military Healthcare manages the network and utilization review.