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HCC 193: Chronic Inflammatory Demyelinating Polyneuritis and Multifocal Motor Neuropathy

HCC 193, Chronic Inflammatory Demyelinating Polyneuritis and Multifocal Motor Neuropathy, is one of the 115 payment categories in the CMS-HCC V28 model. 2 ICD-10-CM codes map to it in the payment year 2027 mapping, and a documented diagnosis in the category adds a relative factor of 1.692 to the risk score of a community, non-dual, aged beneficiary (1.427 disabled, 0.913 institutional). It sits at the top of its hierarchy, so no other category overrides it.

QuickIntell editorial content · Legacy registry date · Review not verified

Data effective
Data currency: ICD-10-CM to HCC mapping PY2027 initial (effective dates of service 2026, payment year 2027); CMS-HCC V28 model software V2826.115.T2 (effective payment year 2027). Next CMS release: PY2027 midyear final mapping (spring 2027) and PY2028 proposed model (February 2027).
Mapped ICD-10-CM codes
2
Factor, community non-dual aged
1.692
Factor, institutional
0.913
Hierarchy
Top of hierarchy

Relative factors by segment

Each segment is a separate regression; the factor is added to the beneficiary's demographic factors and other categories, then normalized and reduced by the coding intensity adjustment before it meets the plan's base rate. A factor of 1.000 equals the expected cost of an average beneficiary.

CMS-HCC V28 relative factors for HCC 193 by model segment
SegmentModel codeRelative factor
Community, non-dual, agedCNA_HCC1931.692
Community, non-dual, disabledCND_HCC1931.427
Community, full-benefit dual, agedCFA_HCC1930.957
Community, full-benefit dual, disabledCFD_HCC1930.939
Community, partial-benefit dual, agedCPA_HCC1931.149
Community, partial-benefit dual, disabledCPD_HCC1930.850
Long-term institutionalINS_HCC1930.913

Hierarchy

HCC 193 is not part of a hierarchy: it is paid whenever a mapped diagnosis is documented, independently of the beneficiary's other categories.

ICD-10-CM codes that map to HCC 193

2 codes map to this category in the PY2027 initial mapping. Descriptions are the CMS mapping descriptions for the FY2026 code set; a code that is deleted or split in the October code update stays valid for dates of service before the change.

ICD-10-CM codes mapped to HCC 193 in the CMS PY2027 initial mapping
ICD-10-CMDescription
G6181Chronic inflammatory demyelinating polyneuritis
G6182Multifocal motor neuropathy

Where these codes sat in the V22 model

The V28 recalibration renumbered and regrouped categories; this table shows which legacy V22 categories the same ICD-10 codes belonged to, which is the quickest way to reconcile a V22-era HCC gap list with the current model.

V22 categories that the HCC 193 codes mapped to
V22 HCCCodes
752

Capturing and defending the category

A category counts for a payment year when a mapped diagnosis is documented at least once during the data collection year by an acceptable provider type at a face-to-face or audio-video encounter, and when the note shows the condition was monitored, evaluated, assessed or treated. Chronic conditions do not carry forward: a category that is not re-documented in the year drops out of the score, which is why annual wellness visits and problem-list reconciliation are where most recapture happens. Risk adjustment data validation audits sample enrollees and ask for the medical record behind each submitted category; an unsupported category is removed and, under the extrapolation rules, the error rate is applied across the contract. The QuickIntell risk adjustment product surfaces suspected and unsupported categories from the chart, and the HCC hub lists every V28 category with its factor and code count.

Frequently asked questions

Which ICD-10 codes map to HCC 193?

2 ICD-10-CM codes map to HCC 193 in the CMS PY2027 initial mapping, for example G6181 Chronic inflammatory demyelinating polyneuritis; G6182 Multifocal motor neuropathy. The full list is on this page; a code counts only when it is documented at a face-to-face or video encounter in the data collection year and supported by the record.

How much does HCC 193 add to a risk score?

The V28 relative factor for HCC 193 is 1.692 for a community, non-dual, aged beneficiary, 0.957 for full-benefit dual aged, 1.427 for non-dual disabled and 0.913 for long-term institutional members. A factor of 1.000 equals the expected annual cost of an average beneficiary, so the category's share of the payment follows the plan's base rate for that segment.

Does HCC 193 count together with related categories?

HCC 193 is not part of a hierarchy, so it is paid whenever it is documented regardless of which other categories the beneficiary has.

What has to be documented for HCC 193 to be valid?

The diagnosis must be recorded by an acceptable provider type during a face-to-face or audio-video encounter in the service year, with the note showing that the condition was monitored, evaluated, assessed or treated. Risk adjustment data validation audits recover payment for categories the record does not support, so the code on the claim and the assessment in the note must match.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-02. Verify against the primary file before billing or contracting decisions.

Disclaimer

Relative factors and mappings are reproduced from the CMS risk adjustment model files as an operational reference. Payment depends on the plan's base rate, normalization, the coding intensity adjustment and the enrollee's segment. Not legal, clinical or billing advice.