CMS-HCC Risk Adjustment · Retired V24 Model 76 Codes

V24 HCC 166 (Archived Category) ICD-10-CM

HCC 166 is a payment category of the retired CMS-HCC V24 model, which last determined Medicare Advantage payment in 2025. The 76 ICD-10-CM codes below are its final mappings, kept for lookback analysis and RADV audit reference. Each code shows where it maps in the live V28 model.

✗ Retired model · not used for current Medicare Advantage paymentLast paid PY 2025 · kept for lookback and RADV reference
76
ICD-10-CM Codes
76
Still Risk-Adjust in V28
0
No V28 Successor
PY 2025
Last Paid Year
CMS-HCC V24

Archived Codes of V24 HCC 166 76 codes

76 of 76 shown
  • S06.1X3A Traumatic cerebral edema with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.1X4A Traumatic cerebral edema with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.1X5A Traumatic cerebral edema with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.1X6A Traumatic cerebral edema with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.2X3A Diffuse traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.2X4A Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.2X5A Diffuse traumatic brain injury with loss of consciousness greater than 24 hours with return to pre-existing conscious levels, initial encounter now HCC 397
  • S06.2X6A Diffuse traumatic brain injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.303A Unspecified focal traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.304A Unspecified focal traumatic brain injury with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.305A Unspecified focal traumatic brain injury with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.306A Unspecified focal traumatic brain injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.313A Contusion and laceration of right cerebrum with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.314A Contusion and laceration of right cerebrum with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.315A Contusion and laceration of right cerebrum with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.316A Contusion and laceration of right cerebrum with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.323A Contusion and laceration of left cerebrum with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.324A Contusion and laceration of left cerebrum with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.325A Contusion and laceration of left cerebrum with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.326A Contusion and laceration of left cerebrum with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.333A Contusion and laceration of cerebrum, unspecified, with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.334A Contusion and laceration of cerebrum, unspecified, with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.335A Contusion and laceration of cerebrum, unspecified, with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.336A Contusion and laceration of cerebrum, unspecified, with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.343A Traumatic hemorrhage of right cerebrum with loss of consciousness of 1 hours to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.344A Traumatic hemorrhage of right cerebrum with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.345A Traumatic hemorrhage of right cerebrum with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.346A Traumatic hemorrhage of right cerebrum with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.353A Traumatic hemorrhage of left cerebrum with loss of consciousness of 1 hours to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.354A Traumatic hemorrhage of left cerebrum with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.355A Traumatic hemorrhage of left cerebrum with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.356A Traumatic hemorrhage of left cerebrum with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.363A Traumatic hemorrhage of cerebrum, unspecified, with loss of consciousness of 1 hours to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.364A Traumatic hemorrhage of cerebrum, unspecified, with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.365A Traumatic hemorrhage of cerebrum, unspecified, with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.366A Traumatic hemorrhage of cerebrum, unspecified, with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.373A Contusion, laceration, and hemorrhage of cerebellum with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.374A Contusion, laceration, and hemorrhage of cerebellum with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.375A Contusion, laceration, and hemorrhage of cerebellum with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.376A Contusion, laceration, and hemorrhage of cerebellum with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.383A Contusion, laceration, and hemorrhage of brainstem with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.384A Contusion, laceration, and hemorrhage of brainstem with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.385A Contusion, laceration, and hemorrhage of brainstem with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.386A Contusion, laceration, and hemorrhage of brainstem with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.4X3A Epidural hemorrhage with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.4X4A Epidural hemorrhage with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.4X5A Epidural hemorrhage with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.4X6A Epidural hemorrhage with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.5X3A Traumatic subdural hemorrhage with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.5X4A Traumatic subdural hemorrhage with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.5X5A Traumatic subdural hemorrhage with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.5X6A Traumatic subdural hemorrhage with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.6X3A Traumatic subarachnoid hemorrhage with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.6X4A Traumatic subarachnoid hemorrhage with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.6X5A Traumatic subarachnoid hemorrhage with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.6X6A Traumatic subarachnoid hemorrhage with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.813A Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.814A Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.815A Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.816A Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.823A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.824A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.825A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.826A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.893A Other specified intracranial injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.894A Other specified intracranial injury with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.895A Other specified intracranial injury with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.896A Other specified intracranial injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.8A3A Primary blast injury of brain, not elsewhere classified with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.8A4A Primary blast injury of brain, not elsewhere classified with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.8A5A Primary blast injury of brain, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.8A6A Primary blast injury of brain, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397
  • S06.9X3A Unspecified intracranial injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter now HCC 397
  • S06.9X4A Unspecified intracranial injury with loss of consciousness of 6 hours to 24 hours, initial encounter now HCC 397
  • S06.9X5A Unspecified intracranial injury with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter now HCC 397
  • S06.9X6A Unspecified intracranial injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter now HCC 397

Questions About This Archived Category

Is V24 HCC 166 still paid?

No. The CMS-HCC V24 model last determined Medicare Advantage payment in 2025; from payment year 2026 the V28 model pays 100% of the risk score. This page exists for lookback analysis and RADV audit periods that predate the transition.

Where did these codes go in V28?

Each row above names the code's live V28 category. The category-level picture, with destination counts for every V24 category, is on V24 to V28: What Changed.

Related References

CMS-HCC V24 ArchiveAll Live V28 CategoriesV24 to V28: What ChangedICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, Payment Year 2026 risk adjustment mapping and model software releases (CMS-HCC V28; CMS-HCC V24 from the last published V24 mappings, payment year 2025), applied to the FY 2026 ICD-10-CM code set. ICD List is not affiliated with CMS.