Q85.1 Tuberous sclerosis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Bourneville's disease
• Epiloia

Applies from Q85 Phakomatoses, not elsewhere classified

Excludes1 (never code together)

• ataxia telangiectasia [Louis-Bar] (G11.3)
• familial dysautonomia [Riley-Day] (G90.1)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 23 — Prostate, Breast, and Other Cancers and Tumors
• CMS-HCC V22: HCC 12 — Breast, Prostate, and Other Cancers and Tumors
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 12

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 759.5 Tuberous sclerosis

Diagnosis Index entries for Q85.1

• Bourneville's disease
• Disease, diseased › Bourneville (-Brissaud) (tuberous sclerosis)
• Disease, diseased › Pringle's (tuberous sclerosis)
• Epiloia
• Neurospongioblastosis diffusa
• Nevus › multiplex
• Phakomatosis › Bourneville's
• Pringle's disease (tuberous sclerosis)
• Sclerosis, sclerotic › brain (generalized) (lobular) › tuberous
• Sclerosis, sclerotic › tuberous (brain)
• Syndrome › Bourneville (-Pringle)
• Tuberous sclerosis (brain)

Nearby codes

• Q85.00 Neurofibromatosis, unspecified
• Q85.01 Neurofibromatosis, type 1
• Q85.02 Neurofibromatosis, type 2
• Q85.03 Schwannomatosis
• Q85.09 Other neurofibromatosis
• Q85.1 Tuberous sclerosis (this code)
• Q85.8 Other phakomatoses, not elsewhere classified
• Q85.81 PTEN hamartoma tumor syndrome
• Q85.82 Other Cowden syndrome
• Q85.83 Von Hippel-Lindau syndrome
• Q85.89 Other phakomatoses, not elsewhere classified