2027 ICD-10-CM Diagnosis Code I67.3Progressive vascular leukoencephalopathy
ICD-10-CM Codes›I00–I99›I60-I69›I67
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 127
- Chronic Condition
I67.3 is a billable ICD-10-CM diagnosis code for progressive vascular leukoencephalopathy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 56 through 57, 974 through 976. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 175 closely related codes. Coders also document this condition as pontine autosomal dominant microangiopathy with leukoencephalopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined cerebrovascular disease and Other nervous system disorders (neither hereditary nor degenerative).
For Medicare Advantage risk adjustment, I67.3 maps to CMS-HCC Category 127 (Dementia, Mild or Unspecified) under the V28 model, adding a risk factor of about 0.341 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I67.3 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Pontine autosomal dominant microangiopathy with leukoencephalopathy
- Small vessel cerebrovascular disease
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I67.3: its own notes plus those printed at I67, block I60-I69, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Binswanger's disease
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- traumatic intracranial hemorrhage (S06.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- sequelae of the listed conditions (I69.8)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Binswanger's disease I67.3
Leukoencephalopathy See Also: Encephalopathy; G93.49
Binswanger's I67.3
vascular, progressive I67.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
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Convert I67.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I67.3Overview
What is the ICD-10 code for progressive vascular leukoencephalopathy?
The ICD-10-CM code for progressive vascular leukoencephalopathy is I67.3 (sometimes written as I673). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I67.3 (Other cerebrovascular diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report progressive vascular leukoencephalopathy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I67.3 group to?
When progressive vascular leukoencephalopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 975, 57, 56, with relative weights from 0.7879 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I67.3 a CC or MCC?
CMS lists I67.3 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 175 closely related codes in its exclusion list.
Can I67.3 be reported with a code from I63.2?
Not as a rule. The Excludes1 note at I67, which applies to I67.3, lists "Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is I67.3?
I67.3 (progressive vascular leukoencephalopathy) maps to CMS-HCC Category 127 (Dementia, Mild or Unspecified), commonly written as HCC 127, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 52 under the retired V24 model. It also maps in the ESRD (V21) and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 112.
Does I67.3 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I67.3 adds a risk adjustment factor of about 0.341 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.000 to 0.438 depending on the payment segment). A more severe related category (HCC 125 and HCC 126) supersedes it when both are reported. See the full factor table on the HCC 127 category page.
