ICDcodes.org
FY2027

R83.9 — Unspecified abnormal finding in cerebrospinal fluid

BillableUnspecified

Is R83.9 billable?

Yes, but R83.9 is an unspecified code. R83.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, R83.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting R83.9 — the more specific alternatives are listed below.

R83.9 at a glance

CodeR83.9
DescriptionUnspecified abnormal finding in cerebrospinal fluid
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does R83.9 group to?

R83.9 sits in MDC 01 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 091Other Disorders of Nervous System with MCCmedical
  • 092Other Disorders of Nervous System with CCmedical
  • 093Other Disorders of Nervous System without CC/MCCmedical

How is R83.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to R83.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Abnormal, abnormality, abnormalities › cerebrospinal fluid

Excludes1 — never code together — inherited from R83-R89

The conditions below can never be reported together with R83.9 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 R83.9, but a patient may have both at the same time. When documentation supports it, R83.9 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 R83.9, but a patient may have both at the same time. When documentation supports it, R83.9 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 R83.9 existed?

R83.9 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.

What other codes are in the R83 family? (8)