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ICD-10-CM 2027 diagnosis code

R77.2Abnormality of alphafetoprotein

✓ Billable / specific

R77.2 is a valid, billable ICD-10-CM code for abnormality of alphafetoprotein. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R77.2

R77.2 is the ICD-10-CM diagnosis code for abnormality of alphafetoprotein. It belongs to category R77 (other abnormalities of plasma proteins), block R70-R79 (abnormal findings on examination of blood, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R77 (other abnormalities of plasma proteins), R77.2 is specifically for abnormality of alphafetoprotein. Related codes cover abnormality of albumin (R77.0), abnormality of globulin (R77.1), other specified abnormalities of plasma proteins (R77.8) and abnormality of plasma protein, unspecified (R77.9).

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 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), 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 790.99 (other nonspecific findings on examination of blood).

Notes that apply from higher levels

Instructions written at a parent level also apply to R77.2.

› From R77 Other abnormalities of plasma proteins
Excludes1
  • disorders of plasma-protein metabolism (E88.0-)

Broader instructions also apply from R70-R79 Abnormal findings on examination of blood, without diagnosis and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to R77.2.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

ICD-9-CM equivalent

Converter →
  • 790.99Other nonspecific findings on examination of bloodapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R77.2

Is R77.2 billable?

Yes. R77.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R77.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R77.2 as a principal diagnosis.

Is R77.2 a CC or MCC?

No. R77.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R77.2 group to?

R77.2 is used in the MS-DRG v44.0 logic for MS-DRG 947 (Signs and Symptoms with MCC) and MS-DRG 948 (Signs and Symptoms without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R77.2?

The CMS General Equivalence Mappings map R77.2 to ICD-9-CM 790.99.