ICD-10-CM 2027
ICD-10 code for Chief cell adenoma
From the official ICD-10-CM alphabetic index entry “Adenoma › chief cell”. Page updated September 29, 2026.
About coding Chief cell adenoma
The ICD-10-CM code for Chief cell adenoma is D35.1 (Benign neoplasm of parathyroid gland).
Within D35 (benign neoplasm of other and unspecified endocrine glands), D35.1 is specifically for benign neoplasm of parathyroid gland. Related codes cover adrenal gland (D35.0), pituitary gland (D35.2), craniopharyngeal duct (D35.3), pineal gland (D35.4), carotid body (D35.5), aortic body and other paraganglia (D35.6), other specified endocrine glands (D35.7) and endocrine gland, unspecified (D35.9).
Use an additional code to identify any functional activity.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about Chief cell adenoma ICD-10 codes
What is the ICD-10 code for Chief cell adenoma?
- D35.1 — Benign neoplasm of parathyroid gland.
Is D35.1 billable?
- Yes. D35.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D35.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D35.1 as a principal diagnosis.
Is D35.1 a CC or MCC?
- No. D35.1 is neither a CC nor an MCC under MS-DRG v44.0.