ICD-10-CM 2027
ICD-10 code for Vital capacity diminished
From the official ICD-10-CM alphabetic index entry “Diminished, diminution › vital capacity”. Page updated September 29, 2026.
About coding Vital capacity diminished
The ICD-10-CM code for Vital capacity diminished is R94.2 (Abnormal results of pulmonary function studies).
Within R94 (abnormal results of function studies), R94.2 is specifically for abnormal results of pulmonary function studies. Related codes cover of central nervous system (R94.0), of peripheral nervous system and special senses (R94.1), cardiovascular function studies (R94.3), kidney function studies (R94.4), liver function studies (R94.5), thyroid function studies (R94.6), other endocrine function studies (R94.7) and of other organs and systems (R94.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 205 (Other Respiratory System Diagnoses with MCC, relative weight 1.8244) and DRG 206 (Other Respiratory System Diagnoses without MCC, relative weight 0.9257), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Vital capacity diminished ICD-10 codes
What is the ICD-10 code for Vital capacity diminished?
- R94.2 — Abnormal results of pulmonary function studies.
Is R94.2 billable?
- Yes. R94.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R94.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R94.2 as a principal diagnosis.
Is R94.2 a CC or MCC?
- No. R94.2 is neither a CC nor an MCC under MS-DRG v44.0.