E83.30
BillableDisorder of phosphorus metabolism, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is E83.30 an HCC code?
No. E83.30 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 E83.30
For E83.30to 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 E83.30 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
E83.30 is the ICD-10-CM diagnosis code for disorder of phosphorus metabolism, unspecified. A problem with how the body regulates phosphorus levels, but the specific type is not identified. E83.30 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).
E83.30 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.
This code does NOT map to a CMS-HCC under V24 or V28 models. It maps only to RxHCC 43. No RAF score impact. If familial hypophosphatemia can be confirmed, E83.31 maps to V28 HCC 50 (RAF 0.289) and RxHCC 42 — a significant specificity upgrade.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E83.30 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Query the provider to determine if the phosphorus disorder is high, low, or another specific type
- •This unspecified code should be avoided when more specific information is available
Clinical Significance
Unspecified phosphorus metabolism disorders reflect abnormalities in phosphate regulation that can affect bone mineralization, muscle function, and cellular energy metabolism. While clinically important, this unspecified code does not capture HCC value, making provider queries for specificity clinically and financially important.
Documentation Requirements
- ✓Documentation of a phosphorus metabolism disorder by the provider
- ✓Serum phosphorus levels and trend
- ✓Associated symptoms or complications (bone pain, fractures, muscle weakness)
- ✓Underlying etiology if known (renal, genetic, medication-related)
- ✓Treatment plan (phosphate supplementation, dietary modifications)
Commonly Confused Codes
- •E83.31 — Familial hypophosphatemia: hereditary form with HCC mapping; use when X-linked or autosomal hypophosphatemia is confirmed
- •E83.39 — Other disorders of phosphorus metabolism: use when a specific non-familial phosphorus disorder is documented
- •E83.32 — Hereditary vitamin D-dependent rickets: a specific phosphorus-related condition affecting vitamin D metabolism
- •N25.0 — Renal osteodystrophy: secondary phosphorus disorder due to kidney disease