P27.9Unspecified chronic respiratory disease originating in the perinatal period

P27.9 is the ICD-10-CM diagnosis code for unspecified chronic respiratory disease originating in the perinatal period. It belongs to category P27 (chronic respiratory disease originating in the perinatal period), block P19-P29 (respiratory and cardiovascular disorders specific to the perinatal period) and chapter 16 (certain conditions originating in the perinatal period). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within P27, choose P27.9 (Unspecified chronic respiratory disease originating in the perinatal period) only when documentation doesn't support a more specific option: Wilson-Mikity syndrome (P27.0), bronchopulmonary dysplasia originating in the perinatal period (P27.1) and other chronic respiratory diseases originating in the perinatal period (P27.8).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 196 (Interstitial Lung Disease with MCC, relative weight 1.8336), DRG 197 (Interstitial Lung Disease with CC, relative weight 0.9492) and DRG 198 (Interstitial Lung Disease without CC/MCC, relative weight 0.7259), 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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 770.7 (chronic respiratory disease arising in the perinatal period).