2027 ICD-10-CM Diagnosis Code B02.24Postherpetic myelitis
ICD-10-CM Codes›A00–B99›B00-B09›B02
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 182
- Not Chronic
B02.24 is a billable ICD-10-CM diagnosis code for postherpetic myelitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 23 through 24, 97 through 99. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 41 closely related codes. Coders also document this condition as herpes zoster myelitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.
For Medicare Advantage risk adjustment, B02.24 maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries) under the V28 model, adding a risk factor of about 0.478 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
B02.24 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.
- Herpes zoster myelitis
- Post-infective myelitis
- Postvaricella myelitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B02.24: its own notes plus those printed at B02 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- shingles
- zona
- diseases generally recognized as communicable or transmissible
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.
- Herpes zoster myelitis
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.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B02.24, its category, or a range that includes it.
Excludes2 4
These codes carry an Excludes2 note naming B02.24: its condition is not part of those codes, and both may be reported when the patient has both.
- B10 Other human herpesvirusesherpes zoster (B02.-) names B02.-, which includes this code
- B10 Other human herpesviruseshuman herpesvirus 3 (B01.-, B02.-) names B02.-, which includes this code
- B10 Other human herpesviruseszoster (B02.-) names B02.-, which includes this code
- Block L00-L08 Infections of the skin and subcutaneous tissuezoster (B02.-) names B02.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Shingles
Shingles (herpes zoster) is an infection that causes a painful rash. It is caused by the varicella-zoster virus (VZV). This is the same virus that causes chickenpox. After you have chickenpox, the virus stays in your body. It may not cause problems for many years. But as you get older, the virus may become active again and cause shingles.
The full article covers:
- What is shingles?
- Is shingles contagious?
- Who is at risk for shingles?
- What are the symptoms of shingles?
- What other problems can shingles cause?
- How is shingles diagnosed?
- What are the treatments for shingles?
- Can shingles be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B02.24 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B02.24Overview
What is the ICD-10 code for postherpetic myelitis?
The ICD-10-CM code for postherpetic myelitis is B02.24 (sometimes written as B0224). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B02.24 (Zoster with other nervous system involvement) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report postherpetic myelitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B02.24 group to?
When postherpetic myelitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 24, 98, 99, 23, 97, with relative weights from 1.5249 to 5.7422 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B02.24 a CC or MCC?
CMS lists B02.24 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 41 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B02.24?
Under the General Equivalence Mappings, postherpetic myelitis converts to ICD-9-CM 053.14 (herpes zoster myelitis). The mapping is a direct match.
What HCC is B02.24?
B02.24 (postherpetic myelitis) maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries), commonly written as HCC 182, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 72 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 155.
Does B02.24 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, B02.24 adds a risk adjustment factor of about 0.478 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.270 to 0.478 depending on the payment segment). A more severe related category (HCC 180, HCC 181, HCC 191, and HCC 192) supersedes it when both are reported. See the full factor table on the HCC 182 category page.
