ICD-10 Code for Supernumerary

The ICD-10-CM 2027 alphabetic index lists supernumerary with the subterms below. More specific codes depend on the details documented, as listed in the official index (29 codes, 28 billable).

Index entries for Supernumerary

aortic cusps – Q23.88
auditory ossicles – Q16.3
bone – Q79.8
breast – Q83.1
carpal bones – Q74.0
cusps, heart valve NEC – Q24.8
- aortic – Q23.88
- mitral – Q23.2
- pulmonary – Q22.3
digit (s) – Q69.9
ear (lobule) – Q17.0
fallopian tube – Q50.6
finger – Q69.0
hymen – Q52.4
kidney – Q63.0
lacrimonasal duct – Q10.6
lobule (ear) – Q17.0
mitral cusps – Q23.2
muscle – Q79.8
nipple (s) – Q83.3
organ or site not listed – see Accessory
ossicles, auditory – Q16.3
ovary – Q50.31
oviduct – Q50.6
pulmonary, pulmonic cusps – Q22.3
rib – Q76.6
- cervical or first (syndrome) – Q76.5
roots (of teeth) – K00.2
spleen – Q89.09
tarsal bones – Q74.2
teeth – K00.1
testis – Q55.29
thumb – Q69.1
toe – Q69.2
uterus – Q51.28
vagina – Q52.1 (header)
vertebra – Q76.49

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.