D18.1 vs D21
D18.1 (Lymphangioma, any site) compared with D21 (Other benign neoplasms of connective and other soft tissue), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. D21 carries an Excludes1 note covering D18.1: “benign neoplasm of vascular tissue (D18.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. D21 carries an Excludes1 note covering D18.1: “lymphangioma (D18.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| D18.1Lymphangioma, any site | D21Other benign neoplasms of connective and other soft tissue | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Lymphangioma, any site is a billable ICD-10-CM diagnosis code (D18.1). | Other benign neoplasms of connective and other soft tissue is a non-billable ICD-10-CM category code (D21). |
| Includes | — | benign neoplasm of blood vessel benign neoplasm of bursa benign neoplasm of cartilage benign neoplasm of fascia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources