C83.9A
BillableNon-follicular (diffuse) lymphoma, unspecified, in remission
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C83.9A an HCC code?
Yes. C83.9A maps to Breast, Prostate, Colorectal and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Lymphoma and Other Cancers 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 C83.9A
For C83.9A to 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 C83.9A during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C83.9A is the ICD-10-CM diagnosis code for non-follicular (diffuse) lymphoma, unspecified, in remission. This code describes a type of blood cancer called non-follicular lymphoma where the specific subtype cannot be determined, and the patient is currently in remission (cancer is not actively growing or spreading). Remission means the cancer is under control, though the patient may still require monitoring and treatment. C83.9A sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of lymphoid, hematopoietic and related tissue (c81-c96).
Under the CMS-HCC V28 risk adjustment model, C83.9A maps to Breast, Prostate, Colorectal and Other Cancers and Tumors (HCC 21) with a community, non-dual, aged base RAF weight of 0.545. Under the older CMS-HCC V24 model, C83.9A maps to Lymphoma and Other Cancers (HCC 10) with a community, non-dual, aged base RAF weight of 0.675. 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.
The '5th character A' indicates remission status—ensure documentation clearly states the patient is in remission before assigning this code; use a different 5th character (0, 1, or B) if remission status is not documented. Because C83.9A 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 C83.9A sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •The '5th character A' indicates remission status—ensure documentation clearly states the patient is in remission before assigning this code; use a different 5th character (0, 1, or B) if remission status is not documented
- •This is an unspecified code (9th character); attempt to obtain more specific lymphoma subtype information from pathology reports or oncology notes before defaulting to 'unspecified'
Clinical Significance
Non-follicular (diffuse) lymphoma, unspecified type, in remission indicates that the patient's unspecified non-follicular lymphoma has responded to treatment and is no longer actively detectable. This code is used when remission status is confirmed but the original subtype was not specified or is unknown. It captures the ongoing surveillance needs and potential for relapse that characterize lymphoma survivors.
Documentation Requirements
- ✓Explicit provider documentation of remission status
- ✓Supporting evidence (negative imaging, normal labs, or pathology)
- ✓History of non-follicular lymphoma diagnosis
- ✓Ongoing surveillance plan
- ✓Date of remission and interval since last treatment