2026 ICD-10-CM Diagnosis Code R09.02Hypoxemia

ICD-10-CM Codes›R00–R99›R00-R09›R09

ICD-10-CM R09.02
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R09.02 is a billable ICD-10-CM diagnosis code for hypoxemia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 205 through 206. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory signs and symptoms.

Code Identity

ICD-10-CM Code
R09.02
Billable Status
Yes — Valid for Submission
Code Describes
Hypoxemia
Short Description
Hypoxemia
Same as the full description in the CMS dataset.
Parent Code
R09.0
Asphyxia and hypoxemia

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR00-R09Symptoms and signs involving the circulatory and respiratory systems
CategoryR09Other symptoms and signs involving the circulatory and respiratory system
This CodeR09.02Hypoxemia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anoxic epileptic seizure
  • Anoxic neuropathy
  • Anoxic seizure
  • Arterial oxygen concentration below reference range
  • Blood gases outside reference range
  • Blood oxygen concentration below reference range
  • Blood oxygen level outside reference range
  • Desaturation of blood
  • Dialysis-associated hypoxia
  • Erythrocytosis due to alveolar hypoventilation
  • Erythrocytosis due to tissue hypoxemia
  • Finding of arterial oxygen concentration
  • Hypoxemia
  • Hypoxemia during surgery
  • Hypoxia
  • Hypoxia-associated cirrhosis
  • Orthodeoxia
  • Oxygen supply absent
  • Pulmonary hypertension due to lung disease and/or hypoxia
  • Reflex anoxic seizure

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

  • - Hypoxia - See Also: Anoxia; - R09.02

External Cause of Injuries IndexGuidance

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

    • Anoxemia
    • Anoxia(pathological)
    • Deficit
      • oxygen
    • Hypoxemia
    • Hypoxia

Clinical ClassificationClinical

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

CCSR SYM013
Respiratory signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Altitude Sickness

    multiple symptoms associated with reduced oxygen at high altitude.

  • Aryl Hydrocarbon Receptor Nuclear Translocator

    aryl hydrocarbon receptor nuclear translocator is a basic helix-loop-helix motif containing protein that forms a complex with dioxin receptor. the complex binds xenobiotic regulatory elements and activates transcription of a variety of genes including udp glucuronosyltransferase. ahr nuclear translocator is also a subunit of hypoxia-inducible factor 1.

  • Cell Hypoxia

    a condition of decreased oxygen content at the cellular level.

  • Fetal Hypoxia

    deficient oxygenation of fetal blood.

  • Hypoxia

    sub-optimal oxygen levels in the ambient air of living organisms.

  • Hypoxia, Brain

    a reduction in brain oxygen supply due to anoxemia (a reduced amount of oxygen being carried in the blood by hemoglobin), or to a restriction of the blood supply to the brain, or both. severe hypoxia is referred to as anoxia and is a relatively common cause of injury to the central nervous system. prolonged brain anoxia may lead to brain death or a persistent vegetative state. histologically, this condition is characterized by neuronal loss which is most prominent in the hippocampus; globus pallidus; cerebellum; and inferior olives.

  • Hypoxia-Inducible Factor 1

    a basic helix-loop-helix transcription factor that plays a role in apoptosis. it is composed of two subunits: aryl hydrocarbon receptor nuclear translocator and hypoxia-inducible factor 1, alpha subunit.

  • Hypoxia-Inducible Factor 1, alpha Subunit

    hypoxia-inducible factor 1, alpha subunit is a basic helix-loop-helix transcription factor that is regulated by oxygen availability and is targeted for degradation by vhl tumor suppressor protein.

  • Hypoxia-Inducible Factor-Proline Dioxygenases

    dioxygenase enzymes that specifically hydroxylate a proline residue on the hypoxia-inducible factor 1, alpha subunit. they are oxygen-dependent enzymes that play an important role in mediating cellular adaptive responses to hypoxia.

  • Hypoxia-Ischemia, Brain

    a disorder characterized by a reduction of oxygen in the blood combined with reduced blood flow (ischemia) to the brain from a localized obstruction of a cerebral artery or from systemic hypoperfusion. prolonged hypoxia-ischemia is associated with ischemic attack, transient; brain infarction; brain edema; coma; and other conditions.

  • Tumor Hypoxia

    hypoxic conditions in tumor cells due to the tumor outgrowing its blood supply. it is associated with increased metastasis and resistance to radiotherapy and drug therapy.

  • Altitude

    a vertical distance measured from a known level on the surface of a planet or other celestial body.

  • Fetal Blood

    blood of the fetus. exchange of nutrients and waste between the fetal and maternal blood occurs via the placenta. the cord blood is blood contained in the umbilical vessels (umbilical cord) at the time of delivery.

  • Oxygen

    an element with atomic symbol o, atomic number 8, and atomic weight [15.99903; 15.99977]. it is the most abundant element on earth and essential for respiration.

Patient EducationClinical

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.

Read the full article at MedlinePlus

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

Convert R09.02 to ICD-9-CMHistory

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

ICD-9-CM
799.02 Hypoxemia
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 R09.02Overview

Is R09.02 (Asphyxia and hypoxemia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hypoxemia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R09.02 group to?

When hypoxemia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 205, 206, with relative weights from 0.9411 to 1.8310 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R09.02 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the hypoxemia is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R09.02?

Under the General Equivalence Mappings, hypoxemia converts to ICD-9-CM 799.02 (hypoxemia). 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.