L41.5 ICD-10-CM Code: Retiform parapsoriasis
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)
L41.5
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceRetiform parapsoriasis
A rare form of parapsoriasis characterized by a net-like or lacy pattern of skin lesions that resembles a fine mesh or web.
Buddy Insight
Retiform parapsoriasis is a rare variant of parapsoriasis characterized by a distinctive net-like (reticular) pattern of skin lesions.
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 L41.5 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for L41.5 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for L41.5 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 L41.5 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for L41.5 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for L41.5 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 L41.5 an HCC code?
No. L41.5 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 L41.5
For L41.5to 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 L41.5 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
L41.5 is the ICD-10-CM diagnosis code for retiform parapsoriasis. A rare form of parapsoriasis characterized by a net-like or lacy pattern of skin lesions that resembles a fine mesh or web. L41.5 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).
L41.5 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. Coders reviewing L41.5 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 L41.5 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Retiform parapsoriasis is a specific subtype; ensure documentation clearly distinguishes it from other parapsoriasis variants
- •This is a rare condition, so verify clinical documentation supports this specific diagnosis before coding
Clinical Significance
Retiform parapsoriasis is a rare variant of parapsoriasis characterized by a distinctive net-like (reticular) pattern of skin lesions. Like large plaque parapsoriasis, it carries a risk of progression to cutaneous T-cell lymphoma and requires ongoing dermatologic surveillance. Its rarity makes accurate coding important for epidemiological tracking and clinical research.
Documentation Requirements
- ✓Provider documentation of retiform parapsoriasis
- ✓Description of the characteristic net-like or reticular pattern of lesions
- ✓Biopsy results including immunohistochemistry if performed
- ✓Monitoring schedule for malignant transformation
- ✓Current treatment plan
- ✓Comparison with prior examinations for disease progression
Commonly Confused Codes
- •L41.4 (Large plaque parapsoriasis) — large patches without the net-like pattern of retiform
- •L41.3 (Small plaque parapsoriasis) — small patches with low malignant potential
- •C84.0 (Mycosis fungoides) — retiform parapsoriasis may progress to mycosis fungoides
- •L41.8 (Other parapsoriasis) — use L41.5 specifically when retiform pattern is documented