E80.20
BillableUnspecified porphyria
HCC Category Mapping
V28HCC 50 — Glycogen/Amino-Acid/Other Metabolic Disorders
0.289V24HCC 23 — Other Significant Endocrine and Metabolic Disorders
0.230ESRDHCC 23 — Other Significant Endocrine and Metabolic Disorders
0.000RxHCCHCC 43 — Other Significant Endocrine and Metabolic Disorders
0.000What This Code Means
A metabolic disorder affecting heme production with unspecified type, potentially causing abdominal pain, neurological symptoms, or skin problems.
Coding Tips
- •Use this code only when the specific type of porphyria cannot be determined
- •Attempt to obtain more specific diagnosis information for proper code assignment
Clinical Significance
Unspecified porphyria is used when a porphyria diagnosis is established but the specific type has not been determined. Given that different porphyrias require fundamentally different treatments (phlebotomy for PCT, hemin for acute porphyrias), this code should be transitional and prompt further diagnostic workup to identify the exact type.
Documentation Requirements
- ✓Provider diagnosis confirming porphyria
- ✓Porphyrin analysis results (urine, fecal, or plasma) even if type-indeterminate
- ✓Clinical presentation: cutaneous, neurovisceral, or both
- ✓Reason specific type is not identified (initial presentation, workup in progress, atypical pattern)
- ✓Plan for further diagnostic testing to determine porphyria type
- ✓Acute management if symptomatic
Commonly Confused Codes
E80.0 — Hereditary erythropoietic porphyria: use when this specific type is confirmedE80.1 — Porphyria cutanea tarda: use when PCT is specifically diagnosedE80.21 — Acute intermittent porphyria: use when AIP is confirmedE80.29 — Other porphyria: for variegate porphyria, hereditary coproporphyria, or other named typesR82.1 — Porphyrinuria: for abnormal urine porphyrins without confirmed porphyria diagnosis