Texas MMI Workers' Comp: Impairment Rating & What Happens Next (2026)

Reaching Maximum Medical Improvement (MMI) is a critical milestone in your Texas workers' compensation case. MMI determines when Temporary Income Benefits (TIB) end, triggers your permanent impairment rating, and begins Impairment Income Benefits (IIB). Understanding the MMI process protects your rights and ensures accurate benefit calculations.

What Is Maximum Medical Improvement (MMI)?

Definition: The point when your medical condition has stabilized and is unlikely to improve significantly with further medical treatment

Texas Labor Code § 401.011: "Stationary condition that has been reached and is reasonably not expected to improve further"

Key concepts:

• Condition has plateaued
• Further treatment won't produce significant improvement
• Doesn't mean you're healed or pain-free
• Doesn't mean you've reached pre-injury status

Common timeframes: Varies widely (weeks to years depending on injury)

Who Determines MMI?

Treating doctor: Initially assigns MMI date and impairment rating

Designated doctor: DWC-appointed doctor may examine if MMI disputed

Required Medical Examination (RME): Insurance can request additional doctor opinion

Presumptive weight: Designated doctor's opinion given presumptive weight

Final authority: Workers' Compensation judge if dispute goes to hearing

Impairment Rating

Assigned at MMI: Doctor evaluates permanent impairment

Rating system: American Medical Association (AMA) Guides to the Evaluation of Permanent Impairment (4th Edition)

Percentage: 0-100% whole body impairment

Body parts: Each body part rated separately, then combined

Example:

• 10% right shoulder
• 15% lumbar spine
• Combined: Not 25%, but less (combining formula reduces total)

Determines IIB: Rating directly affects income benefit duration

What Happens at MMI

Temporary Income Benefits (TIB) end: No more weekly payments for lost wages

Permanent impairment rating assigned: Doctor evaluates lasting impairment

Work restrictions finalized: Permanent limitations identified

Return to work evaluated: Whether can return to previous job

Impairment Income Benefits (IIB) begin: New benefit type starts

Supplemental Income Benefits (SIB) potential: May qualify after IIB ends

MMI report: Doctor issues detailed report with:

• MMI date
• Impairment rating
• Permanent work restrictions
• Return to work capacity

Temporary Income Benefits (TIB) After MMI

TIB stops: Once MMI reached, no more TIB

Last TIB check: Week MMI is reached

No gap: IIB should begin immediately after TIB ends

Accrued TIB: Any owed TIB from before MMI must still be paid

Impairment Income Benefits (IIB)

Triggered at MMI: Begins when MMI reached and impairment rated

Duration: 3 weeks for each 1% of impairment

Calculation:

• 0% rating → No IIB
• 10% rating → 30 weeks IIB
• 25% rating → 75 weeks IIB
• 50% rating → 150 weeks IIB

Benefit amount: 70% of average weekly wage (same as TIB)

Maximum (2026): $1,239/week

Example: 20% impairment, AWW $1,000/week → 60 weeks × $700/week = $42,000 total IIB

Payment schedule: Bi-weekly

Can work while receiving: Yes, IIB not reduced by earnings

Designated Doctor Examinations

When used: Disputes over MMI date or impairment rating

Who selects: DWC appoints from approved list

Independent: Not treating doctor or insurance doctor

Presumptive weight: DD opinion presumed correct unless overcome by great weight of contrary evidence

You must attend: Failure to attend can result in benefit suspension

Process:

1. DWC orders DD exam
2. You receive appointment notice
3. Attend examination (typically 1-2 hours)
4. DD issues report with MMI/impairment findings
5. Report sent to all parties

Can dispute: But high burden to overcome DD opinion

Disputing MMI or Impairment Rating

Common disputes:

• MMI declared too early (still improving)
• Impairment rating too low
• Wrong body parts rated
• Rating doesn't reflect limitations

Process:

1. Request designated doctor examination
2. DD evaluates and issues opinion
3. If still dispute, proceed to hearing

At hearing: Present medical evidence contradicting MMI/rating

Standard: Great weight of medical evidence required to overcome DD

Attorney essential: Complex medical disputes need legal representation

Impact on Work Status

Can return to work: If physically able within restrictions

Permanent restrictions: Doctor assigns lasting work limitations

Examples:

• No lifting over 20 pounds
• No overhead reaching
• Sit/stand option needed
• No repetitive bending

Employer obligations: No legal duty to accommodate (unless ADA applies)

Vocational issues: If cannot return to previous job, may affect SIB eligibility

Learn more: Returning to Work in Texas

Medical Treatment After MMI

Treatment continues: MMI doesn't end medical care rights

Lifetime medical: Continue to receive reasonable and necessary treatment

May include:

• Ongoing medication
• Periodic doctor visits
• Physical therapy
• Future surgery if condition worsens
• Pain management

No time limit: Medical benefits never expire in Texas

Supplemental Income Benefits (SIB) After IIB

Potential next benefit: After IIB ends, may qualify for SIB

Requirements:

1. 15% or greater impairment rating
2. Cannot earn 80% of pre-injury wages

Duration: 13-week periods, renewable up to 401 total weeks

Work search: Must document efforts to find employment

Good faith requirement: Active job search within restrictions

Learn more: Texas Workers' Comp Benefits

Reopening for Changed Condition

If condition worsens: Can petition to reopen for new impairment rating

New MMI/rating: Would need new medical evaluation

Requirements: Show significant worsening since original MMI

Additional IIB: If new rating higher, receive additional weeks

Medical evidence: Doctor must document worsening

Strategies for Accurate MMI/Rating

1. Don't rush: Make sure truly at MMI before accepting date

2. Full evaluation: Ensure all injured body parts rated

3. Request DD: If disagree with treating doctor's rating

4. Get second opinion: Independent medical evaluation

5. Document limitations: Functional capacity evaluation shows real-world impairment

6. Attorney review: Have lawyer review MMI report before accepting

7. Challenge if premature: If still improving, dispute MMI date

Common Issues

MMI too early: Condition still improving but doctor declares MMI

Low rating: Impairment rating doesn't reflect actual disability

Body parts omitted: Not all injured parts included in rating

Work restrictions inadequate: Restrictions don't match actual limitations

Delayed MMI assignment: Insurance pressure to delay MMI (extends TIB, delays rating)

FAQs

Q: What is MMI in Texas workers' comp? A: Maximum Medical Improvement—when your condition has stabilized and won't improve significantly.

Q: Who decides when I reach MMI? A: Your treating doctor, though designated doctor may evaluate if disputed.

Q: What happens to my benefits at MMI? A: TIB ends, you get impairment rating, IIB begins.

Q: Can I still get medical treatment after MMI? A: Yes, medical benefits continue for life.

Q: What if I disagree with my impairment rating? A: Request designated doctor examination or dispute at hearing.

Q: How long do Impairment Income Benefits last? A: 3 weeks for each 1% of impairment rating.

Q: Can I work while receiving IIB? A: Yes, IIB is not reduced by work earnings.

Q: What if my condition gets worse after MMI? A: Can petition to reopen for new evaluation and potentially higher rating.

Q: What's the difference between MMI and permanent disability? A: MMI is when condition stabilizes. Permanent disability rating is the impairment percentage.

Related Topics

• Texas Workers' Comp Benefits
• Returning to Work in Texas
• Settlement Negotiations
• Texas Workers' Compensation Overview

Legal Disclaimer

This guide provides general information about Maximum Medical Improvement in Texas workers' compensation. MMI determinations and impairment ratings significantly affect your benefits. Consult a qualified Texas workers' compensation attorney to ensure your MMI and rating are accurate.

Last updated: January 5, 2026