Is D21 a billable ICD-10-CM code?

No. D21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D21 sit in the tabular list?

Neoplasms (C00-D49), in the block Benign neoplasms, except benign neuroendocrine tumors (D10-D36).

What cannot be coded together with D21?

D21 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

D21

D21 — Other benign neoplasms of connective and other soft tissue

Non-billable headerICD-10-CM

D21 is a non-billable header ICD-10-CM code for other benign neoplasms of connective and other soft tissue. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

benign neoplasm of articular cartilage (D16.-)
benign neoplasm of cartilage of larynx (D14.1)
benign neoplasm of cartilage of nose (D14.0)
benign neoplasm of connective tissue of breast (D24.-)
benign neoplasm of peripheral nerves and autonomic nervous system (D36.1-)
benign neoplasm of peritoneum (D20.1)
benign neoplasm of retroperitoneum (D20.0)
benign neoplasm of uterine ligament, any (D28.2)
benign neoplasm of vascular tissue (D18.-)
hemangioma (D18.0-)
lipomatous neoplasm (D17.-)
lymphangioma (D18.1)
uterine leiomyoma (D25.-)

Includes

Conditions this code covers.

benign neoplasm of blood vessel
benign neoplasm of bursa
benign neoplasm of cartilage
benign neoplasm of fascia
benign neoplasm of fat
benign neoplasm of ligament, except uterine
benign neoplasm of lymphatic channel
benign neoplasm of muscle
benign neoplasm of synovia
benign neoplasm of tendon (sheath)
benign stromal tumors

Other codes that can never be billed with D21

These codes carry an Excludes1 note pointing at D21. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D21 alone.

D14.0Benign neoplasm of middle ear, nasal cavity and accessory sinuses
D15.1Benign neoplasm of heart
D16Benign neoplasm of bone and articular cartilage
D31Benign neoplasm of eye and adnexa
D13Benign neoplasm of other and ill-defined parts of digestive system

Risk adjustment

D21 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.

Code to one of these instead D21

8 child codes. Green means billable.

Questions about D21

Is D21 a billable ICD-10-CM code?: No. D21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D21 sit in the tabular list?: Neoplasms (C00-D49), in the block Benign neoplasms, except benign neuroendocrine tumors (D10-D36).
What cannot be coded together with D21?: D21 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.