L41.9 ICD-10-CM Code: Parapsoriasis, unspecified
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the skin and subcutaneous tissue (L00-L99) / Papulosquamous disorders (L40-L45)
L41.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceParapsoriasis, unspecified
A chronic skin condition characterized by inflammation and scaling patterns, but the specific type has not been determined or specified.
Buddy Insight
Unspecified parapsoriasis represents a documentation gap in a condition group where specificity matters significantly for clinical management, particularly regarding malignant transformation risk.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
MappedHCC 316
RAF 0.0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for L41.9 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for L41.9 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for L41.9 in this effective period.
Excludes 1
Official- poikiloderma vasculare atrophicans (L94.5)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for L41.9 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for L41.9 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for L41.9 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 L41.9 an HCC code?
No. L41.9 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
HCC Category Mapping
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.
MEAT Criteria for L41.9
For L41.9to 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 L41.9 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
L41.9 is the ICD-10-CM diagnosis code for parapsoriasis, unspecified. A chronic skin condition characterized by inflammation and scaling patterns, but the specific type has not been determined or specified. L41.9 sits in the ICD-10-CM chapter for diseases of the skin and subcutaneous tissue (l00-l99), within the section covering papulosquamous disorders (l40-l45).
L41.9 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.
Does not map to any CMS-HCC in V28, V24, or ESRD models. Maps only to RxHCC 316 (Psoriasis and Other Papulosquamous Disorders) for prescription drug risk adjustment. No direct Medicare Advantage RAF score impact. Query for specificity to ensure accurate clinical risk stratification.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for L41.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a default code; use only when the type of parapsoriasis cannot be determined from documentation
- •Query the provider if additional clinical details are available to assign a more specific code
Clinical Significance
Unspecified parapsoriasis represents a documentation gap in a condition group where specificity matters significantly for clinical management, particularly regarding malignant transformation risk. Small plaque parapsoriasis is largely benign, while large plaque and retiform variants carry significant lymphoma risk. This code should always prompt a query for clarification.
Documentation Requirements
- ✓Provider documentation of parapsoriasis
- ✓Any available description of lesion characteristics
- ✓Biopsy results if available
- ✓Current treatment approach
- ✓Query for specification of parapsoriasis type (small plaque, large plaque, retiform)
Commonly Confused Codes
- •L41.3 (Small plaque parapsoriasis) — benign variant; query to distinguish
- •L41.4 (Large plaque parapsoriasis) — pre-malignant variant; query to distinguish
- •L41.5 (Retiform parapsoriasis) — net-like pattern variant with malignant potential
- •L40.9 (Psoriasis, unspecified) — parapsoriasis and psoriasis are different conditions