What is ICD-10 code B02.23?

B02.23 is the ICD-10-CM diagnosis code for Postherpetic polyneuropathy. This is nerve damage that occurs as a complication after shingles (herpes zoster), causing pain, weakness, or numbness in the affected areas. It represents ongoing nerve pain that persists even after the shingles rash has healed. B02.23 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. B02.23 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. B02.23 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. B02.23 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for B02.23?

B02.23 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards B02.23 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

What should coders know when reporting B02.23?

This code should only be used when documenting nerve pain/damage that develops following a shingles infection; ensure the shingles episode has resolved before coding postherpetic polyneuropathy Specify the anatomical location when possible (e.g., upper limb, lower limb, trunk) using appropriate laterality codes if the documentation supports it

B02.23: Postherpetic polyneuropathy — ICD-10

ICD-10-CM Code View

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Code lookupB02.23Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Viral infections characterized by skin and mucous membrane lesions (B00-B09)

B02.23

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Postherpetic polyneuropathy

This is nerve damage that occurs as a complication after shingles (herpes zoster), causing pain, weakness, or numbness in the affected areas. It represents ongoing nerve pain that persists even after the shingles rash has healed.

Buddy Insight

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Not risk-adjusted for this model/period.

RAF 0

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Not risk-adjusted for this model/period.

RAF 0

RXHCC

Mapped

HCC 168

Trigeminal and Postherpetic N...

RAF 0.0

Code Trumping

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Code Book Path

Official

B02Zoster [herpes zoster]

B02.2Zoster with other nervous system involvement

B02.23Postherpetic polyneuropathy

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for B02.23 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for B02.23 in this effective period.

Related Child Codes

Official

B02.21Postherpetic geniculate ganglionitis

B02.22Postherpetic trigeminal neuralgia

B02.24Postherpetic myelitis

B02.29Other postherpetic nervous system involvement

Includes

Official

ICD-10-CM does not list Includes notes for B02.23 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for B02.23 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for B02.23 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for B02.23 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for B02.23 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documented history of prior herpes zoster infection with timeline

Polyneuropathy findings: multiple nerve distribution involvement beyond original dermatome

Nerve conduction study/EMG results if performed showing multi-nerve involvement

Symptom documentation: pain, numbness, weakness, distribution pattern

MEAT Support

HCC Buddy guidance

Documented history of prior herpes zoster infection with timeline

Polyneuropathy findings: multiple nerve distribution involvement beyond original dermatome

Nerve conduction study/EMG results if performed showing multi-nerve involvement

Symptom documentation: pain, numbness, weakness, distribution pattern

Audit Caution

HCC Buddy guidance

Coding generic polyneuropathy (G62.x) when the etiology is clearly postherpetic — this loses the causal relationship

Confusing single-dermatome postherpetic neuralgia with polyneuropathy — polyneuropathy involves multiple nerve distributions

Not documenting the temporal and causal relationship between the prior shingles episode and current polyneuropathy

Using B02.23 for diabetic polyneuropathy that coincidentally occurs after shingles — verify causation

Common Mistakes

HCC Buddy guidance

B02.22 (Postherpetic trigeminal neuralgia) — Specific to the trigeminal nerve; polyneuropathy involves multiple nerves

G62.9 (Polyneuropathy, unspecified) — Generic polyneuropathy without postherpetic cause; B02.23 requires documented shingles history

B02.29 (Other postherpetic nervous system involvement) — B02.23 is more specific for polyneuropathy; use B02.29 only for nervous system complications not covered by B02.21-B02.24

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is B02.23 an HCC code?

No. B02.23 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

HCC Category Mapping

RxHCCHCC 168, Trigeminal and Postherpetic Neuralgia

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work B02.23 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for B02.23

For B02.23to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed B02.23 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

B02.23 is the ICD-10-CM diagnosis code for postherpetic polyneuropathy. This is nerve damage that occurs as a complication after shingles (herpes zoster), causing pain, weakness, or numbness in the affected areas. It represents ongoing nerve pain that persists even after the shingles rash has healed. B02.23 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering viral infections characterized by skin and mucous membrane lesions (b00-b09).

B02.23 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Maps only to RxHCC 168 (Vertebral Fractures) with RAF 0.0. This code does NOT map to any V28 or V24 community HCC. It captures risk only in the RxHCC prescription drug model and has no community risk adjustment impact. Coders reviewing B02.23 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B02.23 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This code should only be used when documenting nerve pain/damage that develops following a shingles infection; ensure the shingles episode has resolved before coding postherpetic polyneuropathy
•Specify the anatomical location when possible (e.g., upper limb, lower limb, trunk) using appropriate laterality codes if the documentation supports it

Clinical Significance

Postherpetic polyneuropathy represents widespread nerve damage following herpes zoster, extending beyond the original dermatome to cause pain, weakness, and sensory changes in multiple nerve distributions. This is a more severe and diffuse complication than typical postherpetic neuralgia and may indicate viral spread along neural pathways.

Documentation Requirements

✓Documented history of prior herpes zoster infection with timeline
✓Polyneuropathy findings: multiple nerve distribution involvement beyond original dermatome
✓Nerve conduction study/EMG results if performed showing multi-nerve involvement
✓Symptom documentation: pain, numbness, weakness, distribution pattern
✓Distinction from single-dermatome postherpetic neuralgia (which is more common)

Commonly Confused Codes

•B02.22 (Postherpetic trigeminal neuralgia): Specific to the trigeminal nerve; polyneuropathy involves multiple nerves
•G62.9 (Polyneuropathy, unspecified): Generic polyneuropathy without postherpetic cause; B02.23 requires documented shingles history
•B02.29 (Other postherpetic nervous system involvement): B02.23 is more specific for polyneuropathy; use B02.29 only for nervous system complications not covered by B02.21-B02.24