R91.8 — Other nonspecific abnormal finding of lung field
Is R91.8 billable?
Yes — R91.8 is billable for FY2027. R91.8 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. R91.8 may be submitted for encounters from October 1, 2026 through September 30, 2027.
R91.8 at a glance
| Code | R91.8 |
|---|---|
| Description | Other nonspecific abnormal finding of lung field |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does R91.8 group to?
R91.8 sits in MDC 04 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 204Respiratory Signs and Symptomsmedical
How is R91.8 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to R91.8. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Shadow, lung
- Infiltrate, infiltration › lung
- Infiltrate, infiltration › on chest x-ray
- Infiltrate, infiltration › pulmonary
- Mass › lung
- Abnormal, abnormality, abnormalities › diagnostic imaging › lung
- Nodule, nodular › lung, solitary › multiple (s)
- Nodule, nodular › solitary, lung › multiple (s)
Inclusion terms
Alternative wording in documentation that is classified to R91.8.
- Lung mass NOS found on diagnostic imaging of lung
- Pulmonary infiltrate NOS
- Shadow, lung
Excludes1 — never code together — inherited from R90-R94
The conditions below can never be reported together with R91.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- abnormal findings on antenatal screening of mother (O28.-)
- diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Excludes2 — not included here — inherited from Chapter 18
The conditions below are not part of R91.8, but a patient may have both at the same time. When documentation supports it, R91.8 and the excluded code may both be reported.
How long has R91.8 existed?
R91.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.