Q85.03 ICD-10-CM Code: Schwannomatosis
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 / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Other congenital malformations (Q80-Q89)
Q85.03
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceSchwannomatosis
Schwannomatosis is a rare genetic disorder characterized by multiple benign tumors (schwannomas) growing on nerves throughout the body.
Buddy Insight
Schwannomatosis is the rarest form of neurofibromatosis characterized by multiple schwannomas throughout the nervous system with chronic pain as a predominant feature, requiring specialized pain management and neurological care.
CMS-HCC V28
MappedHCC 23
RAF 0.251
CMS-HCC V24
MappedHCC 12
RAF 0.150
ACA/HHS
00
RAF 0
ESRD/PACE
MappedHCC 12
RAF 0.0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for Q85.03 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for Q85.03 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q85.03 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for Q85.03 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q85.03 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q85.03 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q85.03 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 Q85.03 an HCC code?
Yes. Q85.03 maps to Melanoma and Other Skin Cancers under the CMS-HCC V28 risk adjustment model (and Breast, Prostate, and Other Cancers and Tumors under V24).
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 Q85.03
For Q85.03to 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 Q85.03 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
Q85.03 is the ICD-10-CM diagnosis code for schwannomatosis. Schwannomatosis is a rare genetic disorder characterized by multiple benign tumors (schwannomas) growing on nerves throughout the body. Q85.03 sits in the ICD-10-CM chapter for congenital malformations, deformations and chromosomal abnormalities (q00-qa0), within the section covering other congenital malformations (q80-q89).
Under the CMS-HCC V28 risk adjustment model, Q85.03 maps to Melanoma and Other Skin Cancers (HCC 23) with a community, non-dual, aged base RAF weight of 0.251. Under the older CMS-HCC V24 model, Q85.03 maps to Breast, Prostate, and Other Cancers and Tumors (HCC 12) with a community, non-dual, aged base RAF weight of 0.150. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This is a distinct condition from NF1 and NF2; ensure proper differentiation in documentation. Because Q85.03 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q85.03 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a distinct condition from NF1 and NF2; ensure proper differentiation in documentation
- •Document the location and number of schwannomas when clinically relevant
Clinical Significance
Schwannomatosis is the rarest form of neurofibromatosis characterized by multiple schwannomas throughout the nervous system with chronic pain as a predominant feature, requiring specialized pain management and neurological care. Unlike NF1 and NF2, it typically presents later in life and does not involve bilateral acoustic neuromas.
Documentation Requirements
- ✓Multiple schwannomas confirmed by pathology
- ✓Absence of bilateral vestibular schwannomas
- ✓Chronic pain documentation and assessment
- ✓Genetic testing results (SMARCB1, LZTR1 mutations)
- ✓MRI documentation of multiple nerve tumors
- ✓Exclusion of NF1 and NF2 criteria
- ✓Family history assessment
- ✓Pain management interventions documented