D18.1 — Lymphangioma, any site
D18.1 is a billable, specific ICD-10-CM code for lymphangioma, any site. It is valid for submission on a claim.
Other codes that can never be billed with D18.1
These codes carry an Excludes1 note pointing at D18.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D18.1 alone.
Risk adjustment
D18.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
D18.1 is named in 17 Medicare coverage policies — 17 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56456Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
- A56632Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
How D18.1 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D18.1.
- Hemolymphangioma
- Hygroma(congenital) (cystic)
- Lymphangioendothelioma
- Lymphangioma
- Lymphangiomyoma
- Cyst›lymphangiomatous
- Lymphangioma›capillary
- Lymphangioma›cavernous
- Lymphangioma›cystic
- Nevus›lymphatic
Related codes at this level
Codes that share D18. If D18.1 is not quite right, the correct code is usually one of these.
Questions about D18.1
- Is D18.1 a billable ICD-10-CM code?
- Yes. D18.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D18.1 sit in the tabular list?
- Neoplasms (C00-D49), in the block Benign neoplasms, except benign neuroendocrine tumors (D10-D36).