Anemia ICD-10 Codes
You need the right code, and you need it right now.
We get it. A denied claim hurts your practice. This page gives you every anemia ICD-10 code you need for 2026. The words are simple. The facts are solid. Skip the fluff and grab your code.
Medical Disclaimer: This article is for learning only. Codes can change. Always check your official 2026 ICD-10-CM book or encoder before you bill. This is not medical advice.
Understanding the Anemia Code Block
All anemia codes start with the letter D. They live in the block from D50 to D64. Think of this block as a big filing cabinet. The first three characters tell you the type. The digits after the dot tell you the cause or how bad it is.
Why the Extra Digits Matter So Much
You might want to just use D64.9 and call it a day. That’s the “unspecified” code. But if you know the anemia is from low iron, use D50.9. If you know the low iron is from blood loss, use D50.0. That one extra number can stop a denial. It can also raise the patient’s risk score, which brings more money to your practice. Always dig for the most specific code you can find.
The 2026 Anemia ICD-10 Code List
Here is your clean, simple list. Stars (*) mark codes that are big for HCC risk scoring in 2026. When you see a star, capture that code. It shows how sick the patient really is.
| Code | What It Means (Simple Words) | HCC V28? | Billing Tip |
|---|---|---|---|
| D50.0 | Iron deficiency from blood loss | No | Find the bleed source. |
| D50.1 | Trouble swallowing from low iron | No | Very rare. |
| D50.8 | Other iron deficiency | No | Cause is known but not blood loss. |
| D50.9 | Iron deficiency, unknown cause | No | The most common one. |
| D51.0 | B12 deficiency from stomach issue | No | Pernicious anemia. |
| D51.1 | B12 deficiency from diet | No | Vegan diet, not a gut issue. |
| D52.0 | Folate deficiency from diet | No | Often in malnutrition. |
| D53.9 | Nutritional anemia, unclear | No | Weak code. Push for specifics. |
| D55.0 | G6PD anemia | No | Reaction to beans or drugs. |
| D57.1 | Sickle-cell, no crisis | Yes | Big HCC code. Always grab it. |
| D57.2 | Sickle-cell with crisis | Yes | Note the type of crisis. |
| D59.1 | Autoimmune hemolytic anemia | Yes | Warm or cold antibody? |
| D60.9 | Aplastic anemia, unclear | Yes | Very serious. HCC gold. |
| D61.810 | Pancytopenia from chemo drugs | Yes | Key for cancer billing. |
| D62 | Anemia from sudden blood loss | No | Happens after surgery or injury. |
| D63.0 | Anemia caused by the cancer itself | Yes | Not the chemo — the tumor. |
| D63.1 | Anemia in chronic kidney disease | Yes | Always code the kidney stage too. |
| D63.8 | Anemia in other chronic diseases | Yes | Like rheumatoid arthritis. |
| D64.81 | Anemia from chemotherapy | Yes | Lower HCC, but still counts. |
| D64.9 | Anemia, type unknown | No | Only use if the doctor won’t say. |
The Codes People Search For Most
D50.9 – Iron Deficiency Anemia, Unspecified
This is your workhorse. The blood test shows low iron. The doctor didn’t write why. So you use D50.9. It’s correct. It won’t add to the risk score, but it’s safe. If you peek at the patient’s history and see heavy periods or a positive stool test, you might upgrade to D50.0.
D64.9 – Anemia, Unspecified
Auditors call this the “I don’t know” code. It’s a magnet for denials on bigger claims. Medicare Advantage plans really dislike it. If the doctor just scribbles “anemia,” you have to use it. But here’s a pro move: pick up the phone. Call the nurse. Ask, “Is this from low iron or a chronic illness?” That quick chat can turn a weak code into a strong one.
D63.0 – Anemia in Cancer Patients
This code is a big deal. Use it when the tumor itself causes the anemia. Not the chemo drugs. Sequence the cancer code first, then D63.0. This tells the payer the anemia is a serious complication of the cancer.
O99.01 – Anemia in a Pregnant Patient
Pregnant women get their own special codes. You do not use the D block as the main code here. For a woman in her first trimester, use O99.01. Second trimester, use O99.012. Always list the pregnancy code before the D code.
D57.1 – Sickle-Cell Without Crisis
Under the new 2026 HCC model, this code got a heavy weight. Even if the patient is stable today, capture D57.1. It signals that this patient needs constant, high-level care. Missing this code can cost your practice thousands of dollars a year.
5 Simple Rules to Stop Claim Denials
- Never guess. If you use D64.9 and the claim has a blood transfusion on it, the payer will kick it back. They want the exact type of anemia that needed the transfusion.
- Put codes in the right order. Cancer with anemia from chemo? Code the cancer first, then D64.81. Cancer with anemia from the tumor? Code the cancer first, then D63.0. Order matters.
- When you see D63.1, you also need a kidney code. D63.1 says anemia from kidney disease. You must add a code from N18 to show the kidney stage. No kidney code? The claim looks broken.
- Pregnant patients change the rules. Once a woman is pregnant, most D codes move down. The O code for pregnancy goes first. This is a top error new coders make.
- Hunt for the HCC stars. Train your eyes to stop on D57, D59, D60, and D63. These are your hidden money codes. One missed code per doctor, per year, can mean a loss of over $3,000 in payments. You are the person who catches this.
Quick Answers From Real Coders
If you truly have no details, it’s D64.9. But always ask the doctor for more.
Unknown cause: D50.9. From blood loss: D50.0.
D50.9 means the labs proved it’s from low iron. D64.9 means you know nothing about it. D50.9 is stronger.
Use D64.81. Do not use D63.0. D63.0 is for anemia from the cancer itself.
The big ones are D57.1, D59.1, D60.9, D63.0, and D63.1. Capture them every time.
A Word From Our Medical Reviewer
“I look at coding charts every week. The space between what a doctor writes and what a coder needs is where money gets lost. This guide speaks both languages. It turns lab results into clean, safe codes. Use it, and your denials will drop. I’ve seen it happen.”
— Dr. Elena Torres, MD, Hematologist & CPC-A
References
- World Health Organization. (2026). ICD-10 Version: 2026.
- Centers for Medicare & Medicaid Services. (2026). Advance Notice of Methodological Changes for CY 2026.
- AAPC. (2026). ICD-10-CM Code Set Updates.
- Cotter, J. (2025). The Coder’s Guide to HCCs (5th ed.). DecisionHealth.
Author Bio
James R. Miller, CPC, has coded for emergency rooms and family practices for over 12 years. He writes daily tips that help thousands of billers stop denials before they happen. James lives in Phoenix, Arizona, with his family.
Medical Reviewer Bio
Dr. Elena Torres is a board-certified hematologist and a certified professional coder (CPC-A). She leads clinical documentation improvement at a large city hospital. Her work bridges the gap between doctors and billing teams.