ICD-10 Coding for Iron Overload Without Confirmed Hemochromatosis
For iron overload when hereditary hemochromatosis is not confirmed, use ICD-10 diagnosis code E83.118 (Other hemochromatosis) or E83.119 (Hemochromatosis, unspecified), and for therapeutic phlebotomy, use ICD-10-PCS code 6A550Z3 (Therapeutic phlebotomy, single).
Diagnosis Code Selection
When you have documented iron overload (elevated ferritin and/or transferrin saturation) but have not confirmed hereditary hemochromatosis through genetic testing or other definitive criteria, you need a code that captures iron overload without specifying the hereditary form:
- E83.118 (Other hemochromatosis) - Use this when you have evidence of iron overload that doesn't fit the classic hereditary pattern
- E83.119 (Hemochromatosis, unspecified) - Use this when iron overload is present but the specific type hasn't been determined
- E83.110 (Hereditary hemochromatosis) - Reserve this ONLY for confirmed HFE-related hemochromatosis with genetic confirmation (C282Y homozygotes or compound heterozygotes)
Clinical Context for Code Selection
Based on the guidelines, hereditary hemochromatosis diagnosis requires specific criteria 1, 2, 3:
- For C282Y homozygotes: Transferrin saturation >45-55% AND ferritin >200 µg/L (females) or >300 µg/L (males) is sufficient for diagnosis 3
- For other genotypes or no genetic testing: Requires documented hepatic iron overload on MRI or liver biopsy 3
If you haven't confirmed these criteria but have elevated iron studies, you're dealing with "iron overload, not otherwise specified" - hence E83.118 or E83.119.
Procedure Code for Therapeutic Phlebotomy
ICD-10-PCS code: 6A550Z3
- 6A5 = Extracorporeal or Systemic Therapies, Physiological Systems, Pheresis
- 50 = Circulatory system
- Z3 = Therapeutic phlebotomy, single
This code specifically captures therapeutic phlebotomy (blood removal for treatment purposes), which is distinct from blood donation.
Important Coding Pitfalls to Avoid
Do not use E83.110 (Hereditary hemochromatosis) unless you have:
- Confirmed C282Y/C282Y homozygosity with elevated iron parameters 2, 3
- OR documented hepatic iron overload with appropriate genetic mutations 3
Why this matters clinically: The guidelines emphasize that many patients with elevated ferritin have secondary causes - obesity, metabolic syndrome, alcohol use, or other liver diseases 4. In fact, a 2022 French study found that only 24.4% of patients referred for "hemochromatosis" actually had the C282Y/C282Y genotype 4. The remaining patients had metabolic syndrome (59.3%), central obesity (80.3%), or were heavy drinkers (11.6%) 4.
Documentation Requirements for Insurance Authorization
For phlebotomy authorization, document:
- Specific ferritin level (with trend if available)
- Transferrin saturation percentage
- Exclusion of secondary causes: inflammatory conditions, liver disease (viral hepatitis, NAFLD/NASH, alcoholic liver disease), malignancy
- Clinical rationale: Why phlebotomy is indicated despite unconfirmed hereditary hemochromatosis
The 2011 AASLD guidelines support therapeutic phlebotomy even in patients without confirmed hereditary hemochromatosis when iron overload is documented and causing or threatening organ damage 2. However, they note this is more controversial in asymptomatic patients with only laboratory abnormalities 1, 2.
Alternative Diagnostic Codes to Consider
If you identify a specific secondary cause during workup, use that instead:
- D64.3 - Other sideroblastic anemias (if transfusion-related)
- K70.x - Alcoholic liver disease codes (if alcohol-related)
- K76.0 - Fatty change of liver (if NAFLD-related with iron overload)
These more specific codes may provide better insurance coverage justification than unspecified iron overload codes.