R84.4 — Abnormal immunological findings in specimens from respiratory organs and thorax

Billable

Is R84.4 billable?

Yes — R84.4 is billable for FY2027. R84.4 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. R84.4 may be submitted for encounters from October 1, 2026 through September 30, 2027.

R84.4 at a glance

Code	R84.4
Description	Abnormal immunological findings in specimens from respiratory organs and thorax
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does R84.4 group to?

R84.4 sits in MDC 23 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

947Signs and Symptoms with MCCmedical
948Signs and Symptoms without MCCmedical

How is R84.4 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to R84.4. They show the wording a clinician may have documented, which often differs from the Tabular description.

Abnormal, abnormality, abnormalities › specimen › respiratory organs › immunology

Excludes1 — never code together — inherited from R83-R89

The conditions below can never be reported together with R84.4 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

Excludes1 — never code together — inherited from R84

The conditions below can never be reported together with R84.4 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

blood-stained sputum (R04.2)

Excludes2 — not included here — inherited from Chapter 18

The conditions below are not part of R84.4, but a patient may have both at the same time. When documentation supports it, R84.4 and the excluded code may both be reported.

abnormal findings on antenatal screening of mother (O28.-)
certain conditions originating in the perinatal period (P04-P96)
signs and symptoms classified in the body system chapters
signs and symptoms of breast (N63, N64.5)

Excludes2 — not included here — inherited from R83-R89

The conditions below are not part of R84.4, but a patient may have both at the same time. When documentation supports it, R84.4 and the excluded code may both be reported.

abnormal findings on examination of blood, without diagnosis (R70-R79)
abnormal findings on examination of urine, without diagnosis (R80-R82)
abnormal tumor markers (R97.-)

How long has R84.4 existed?

R84.4 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.