2026 ICD-10-CM Diagnosis Code R79.82Elevated C-reactive protein (CRP)

ICD-10-CM Codes›R00–R99›R70-R79›R79

ICD-10-CM R79.82
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R79.82 is a billable ICD-10-CM diagnosis code for elevated C-reactive protein (CRP). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as c-reactive protein above reference range. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R79.82
Billable Status
Yes — Valid for Submission
Code Describes
Elevated C-reactive protein (CRP)
Short Description
Elevated C-reactive protein (CRP)
Same as the full description in the CMS dataset.
Parent Code
R79.8
Other specified abnormal findings of blood chemistry

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR70-R79Abnormal findings on examination of blood, without diagnosis
CategoryR79Other abnormal findings of blood chemistry
This CodeR79.82Elevated C-reactive protein (CRP)

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • C-reactive protein above reference range
  • C-reactive protein outside reference range

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abnormal, abnormality, abnormalities
      • chemistry, blood
        • C-reactive protein
    • Elevated, elevation
      • C-reactive protein (CRP)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM017
Abnormal findings without diagnosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Blood

Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R79.82 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
790.95 Elev C-reactive protein
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R79.82Overview

Is R79.82 (Other specified abnormal findings of blood chemistry) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report elevated C-reactive protein (CRP) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R79.82 group to?

When elevated C-reactive protein (CRP) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R79.82 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the elevated C-reactive protein (CRP) is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R79.82?

Under the General Equivalence Mappings, elevated C-reactive protein (CRP) converts to ICD-9-CM 790.95 (elev C-reactive protein). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.