Iron deficiency anemia is classified under ICD-10-CM code D50, which requires specifying the cause or type. Common billable codes include D50.0 (secondary to chronic blood loss), D50.1 (sideropenic dysphagia), D50.8 (other), and D50.9 (unspecified).
Primary codes
Billable
Billable
Extension
—
7th character
—
POA exempt
No
Coding risks
- Assigning when documentation supports a more specific code
Hierarchy
Code comparison
Compare key differences between related codes to select the most specific option.
| Code | Description | Scenario |
|---|---|---|
| D50.9 | Iron deficiency anemia, unspecified | IDA documented without a specified cause, blood loss source, or associated dysphagia. |
| D50.0 | Iron deficiency anemia secondary to blood loss (chronic) | IDA documented as due to chronic blood loss, such as GI bleeding or menorrhagia. |
| D50.8 | Other iron deficiency anemias | IDA from a specified cause such as dietary insufficiency, without chronic blood loss or dysphagia. |
| D50.1 | Sideropenic dysphagia | IDA with dysphagia and esophageal webs documented, consistent with Plummer-Vinson syndrome. |
Select the most specific code supported by the encounter documentation. More specific codes improve reimbursement accuracy and reduce audit risk.
Code ranges
Iron deficiency anemia
Anemias caused by insufficient iron for hemoglobin synthesis, whether from chronic blood loss, inadequate intake, or malabsorption.
Nutritional anemias
Anemias resulting from deficiencies of iron, vitamin B12, folate, protein, or other dietary nutrients essential for erythropoiesis.
Aplastic and other anemias
Anemias due to bone marrow failure, hemolysis, chronic disease, or unspecified mechanisms unrelated to nutritional deficiency.
Acute posthemorrhagic anemia
Anemia caused by sudden, acute blood loss rather than gradual chronic bleeding leading to iron store depletion.
Iron deficiency without anemia
Nutritional iron deficiency documented without a concurrent diagnosis of anemia meeting hemoglobin criteria.
Coding risks
Avoid these common coding issues when reporting Iron Deficiency Anemia.
Impact
Assigning D50.9 without documented etiology may miscode cases actually due to chronic blood loss (D50.0).
Mitigation
Consider querying the provider when the cause is absent rather than inferring from low ferritin or menstrual history alone.
Related codes
Ancillary and co-coding
Codes commonly reported with the primary diagnosis on the same claim.
Z-code variants
Family history, personal history, or screening encounter codes related to this condition.
In pregnancy
Pregnancy-specific O-code adaptations used in place of the primary when the condition occurs during or complicates pregnancy.
Differential codes
Alternative or commonly confused codes to consider when documentation suggests a different condition than the primary diagnosis.
Frequently asked questions
Use D50.9 only when the chart lacks documentation of an underlying cause. If chronic blood loss is documented, D50.0 takes precedence.
References
Compiled from the following authoritative coding references. Last updated 2026-08-04.