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  6. 2026 ICD-10-CM Code R94.2

2026 ICD-10-CM Diagnosis Code R94.2

Abnormal results of pulmonary function studies

ICD-10-CM Code:
R94.2
ICD-10 Code for:
Abnormal results of pulmonary function studies
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

R94.2 is a billable diagnosis code used to specify a medical diagnosis of abnormal results of pulmonary function studies. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    R00–R99
    • Abnormal findings on diagnostic imaging and in function studies, without diagnosis
      R90-R94
      • Abnormal results of function studies
        R94

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

  • Abnormal airflow
  • Abnormal blood oxygen pressure
  • Abnormal blood oxygen pressure
  • Abnormal distribution of ventilation
  • Decreased blood oxygen pressure
  • Decreased Bohr effect
  • Decreased diffusion capacity of lung
  • Decreased forced expiratory volume
  • Decreased functional residual capacity
  • Decreased maximal voluntary ventilation
  • Decreased peak expiratory flow rate
  • Decreased respiratory function
  • Decreased total lung capacity
  • Decreased vital capacity
  • Diffusion capacity of lung above reference range
  • FEV1/FVC < 70 percent of predicted
  • FEV1/FVC > 70 percent of predicted
  • FEV1/FVC ratio abnormal
  • Finding of diffusion capacity of lung
  • Finding of diffusion capacity of lung
  • Forced expired volume - finding
  • Forced expired volume - finding
  • Forced vital capacity - finding
  • Forced vital capacity - finding
  • Forced vital capacity below reference range
  • FVC - forced vital capacity abnormal
  • High airway pressure
  • Increased blood oxygen pressure
  • Increased Bohr effect
  • Increased forced expiratory volume
  • Increased functional residual capacity
  • Increased maximal voluntary ventilation
  • Increased peak expiratory flow rate
  • Lung function restrictive
  • Lung function significantly obstructed
  • Lung function testing abnormal
  • Lung volume test abnormal
  • Peak expiratory flow rate - compliance moderate
  • Peak expiratory flow rate - compliance poor
  • Peak expiratory flow rate - finding
  • Peak expiratory flow rate - finding
  • Peak expiratory flow rate - finding
  • Peak expiratory flow rate - technique moderate
  • Peak expiratory flow rate - technique poor
  • Peak flow rate - finding
  • Peak flow rate - finding
  • Peak flow rate - finding
  • Peak flow rate - finding
  • Peak flow rate abnormal
  • Pendelluft
  • Regional ventilation differences
  • Regional ventilation differences due to gravity
  • Regional ventilation differences due to local airway resistance
  • Regional ventilation differences due to pleural pressure
  • Regional ventilation differences due to unequal bronchial pathway lengths
  • Regional ventilation differences due to unequal compliance
  • Regional ventilation differences due to unequal stress
  • Respiratory flow rate abnormal
  • Respiratory flow rate above reference range
  • Respiratory flow rate below reference range
  • Respiratory quotient - finding
  • Respiratory quotient abnormal
  • Serial peak expiratory flow rate abnormal
  • Spirometry reversibility finding
  • Spirometry reversibility positive
  • Vital capacity - finding

Clinical Classification

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Abnormal findings without diagnosis

CCSR Code: SYM017

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Reduced ventilatory capacity
  • Reduced vital capacity

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Index of External Cause of Injuries

References found for this diagnosis code in the External Cause of Injuries Index:

    • Abnormal, abnormality, abnormalities
      • function studies
        • pulmonary
    • Abnormal, abnormality, abnormalities
      • pulmonary
        • test results
    • Diminished, diminution
      • vital capacity
    • Findings, abnormal, inconclusive, without diagnosis
      • function study NEC
        • pulmonary
    • Findings, abnormal, inconclusive, without diagnosis
      • scan NEC
        • lung
    • Reduced
      • ventilatory or vital capacity

Convert R94.2 to ICD-9-CM

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

Abn pulmonary func study

ICD-9-CM: 794.2

This is a direct match with no additional mapping qualifiers. The absence of a flag generally means the mapping is considered exact or precise. In other words, the ICD-10 code maps cleanly to the ICD-9 code without qualification, approximation, or needing multiple codes.

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Patient Education


Lung Diseases

When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease. If all types of lung disease are lumped together, it is the number three killer in the United States.

The term lung disease refers to many disorders affecting the lungs, such as asthma, COPD, infections like influenza, pneumonia and tuberculosis, lung cancer, and many other breathing problems. Some lung diseases can lead to respiratory failure.

Dept. of Health and Human Services Office on Women's Health


[Learn More in MedlinePlus]

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

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.