2026 ICD-10-CM Diagnosis Code D50.9Iron deficiency anemia, unspecified

ICD-10-CM Codes›D50–D89›D50-D53›D50

ICD-10-CM D50.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D50.9 is a billable ICD-10-CM diagnosis code for iron deficiency anemia, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 811 through 812. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional anemia.

Code Identity

ICD-10-CM Code
D50.9
Billable Status
Yes — Valid for Submission
Code Describes
Iron deficiency anemia, unspecified
Short Description
Iron deficiency anemia, unspecified
Same as the full description in the CMS dataset.
Parent Code
D50
Iron deficiency anemia

Code Classification

ChapterD50–D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
SectionD50-D53Nutritional anemias
CategoryD50Iron deficiency anemia
This CodeD50.9Iron deficiency anemia, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anemia during the puerperium
  • Blood dyscrasia puerperal
  • Idiopathic hypochromic anemia
  • Iron deficiency anemia
  • Iron deficiency anemia during maternal intrapartum period
  • Iron deficiency anemia of pregnancy
  • Microcytic anemia
  • Microcytic hypochromic anemia
  • Microcytic normochromic anemia
  • Normocytic hypochromic anemia
  • Postpartum iron deficiency anemia
  • Restless leg syndrome due to iron deficiency anemia
  • Restless legs syndrome
  • Secondary restless legs syndrome
  • Sleep related movement disorder

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR BLD001
Nutritional anemia
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Restless Legs Syndrome

    a disorder characterized by aching or burning sensations in the lower and rarely the upper extremities that occur prior to sleep or may awaken the patient from sleep.

  • Microcytic Anemia

    anemia in which the red blood cell volume is decreased.

Patient EducationClinical

Anemia

If you have anemia, your blood does not carry enough oxygen to the rest of your body. The most common cause of anemia is not having enough iron. Your body needs iron to make hemoglobin. Hemoglobin is an iron-rich protein that gives the red color to blood. It carries oxygen from the lungs to the rest of the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D50.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
280.9 Iron defic anemia NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D50.9Overview

What is the ICD-10 code for iron deficiency anemia, unspecified?

The ICD-10-CM code for iron deficiency anemia, unspecified is D50.9 (sometimes written as D509). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is D50.9 (Iron deficiency anemia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report iron deficiency anemia, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D50.9 group to?

When iron deficiency anemia, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 811, 812, with relative weights from 0.9182 to 1.4043 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D50.9?

Under the General Equivalence Mappings, iron deficiency anemia, unspecified converts to ICD-9-CM 280.9 (iron defic anemia NOS). The mapping is a direct match.