ICD-10-CM 2027
ICD-10 code for congenital substernal thyroid
From the official ICD-10-CM alphabetic index entry “Substernal thyroid › congenital”. Page updated September 29, 2026.
About coding congenital substernal thyroid
The ICD-10-CM code for congenital substernal thyroid is Q89.2 (Congenital malformations of other endocrine glands).
Within Q89, choose Q89.2 (Congenital malformations of other endocrine glands) only when documentation doesn't support a more specific option: congenital absence and malformations of spleen (Q89.0), congenital malformations of adrenal gland (Q89.1), Situs inversus (Q89.3), conjoined twins (Q89.4), multiple congenital malformations, not elsewhere classified (Q89.7), other specified congenital malformations (Q89.8) and congenital malformation, unspecified (Q89.9).
Don't report Q89.2 together with the conditions in its Excludes1 note: congenital goiter (E03.0) and congenital hypothyroidism (E03.1).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for Q89.2)
Common questions about congenital substernal thyroid ICD-10 codes
What is the ICD-10 code for congenital substernal thyroid?
- Q89.2 — Congenital malformations of other endocrine glands.
Is Q89.2 billable?
- Yes. Q89.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q89.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q89.2 as a principal diagnosis.
Is Q89.2 a CC or MCC?
- No. Q89.2 is neither a CC nor an MCC under MS-DRG v44.0.