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ICD-10 Code J45.909: Unspecified asthma, uncomplicated

J45.909 is a billable ICD-10 diagnosis code used to classify Unspecified asthma, uncomplicated in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the respiratory system (J00-J99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the respiratory system (J00-J99).

When is it used?

  • May be used when a clinician documents unspecified asthma, uncomplicated in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
10Diseases of the respiratory system (J00-J99)
block
J40-J4AChronic lower respiratory diseases
category
J45Asthma
category
J45.9Other and unspecified asthma
category
J45.90Unspecified asthma
currentJ45.90

Official coding notes

Inclusion terms
  • Asthma NOS
Excludes2 (may code together if documented)
  • lung diseases due to external agents (J60-J70)

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

PulmonologistGeneral Physician

Related tests

Spirometry
Commonly used to assess airflow limitation in asthma care.
Peak expiratory flow
May help monitor airflow changes over time in asthma follow-up.

Related procedures

Nebulizer treatment
May appear in symptomatic asthma care pathways.
Pulmonary rehabilitation counseling
May be relevant in selected chronic respiratory management pathways.

Coverage-related procedures and services

CPT 86003high
ALLERGEN SPECIFIC IGE; QUANTITATIVE OR SEMIQUANTITATIVE, CRUDE ALLERGEN EXTRACT, EACH
Source: CMS coverage guidance
CPT 86008high
ALLERGEN SPECIFIC IGE; QUANTITATIVE OR SEMIQUANTITATIVE, RECOMBINANT OR PURIFIED COMPONENT, EACH
Source: CMS coverage guidance
CPT 95018high
ALLERGY TESTING, ANY COMBINATION OF PERCUTANEOUS (SCRATCH, PUNCTURE, PRICK) AND INTRACUTANEOUS (INTRADERMAL), SEQUENTIAL AND INCREMENTAL, WITH DRUGS OR BIOLOGICALS, IMMEDIATE TYPE REACTION, INCLUDING TEST INTERPRETATION AND REPORT, SPECIFY NUMBER OF TESTS
Source: CMS coverage guidance
CPT 95017high
ALLERGY TESTING, ANY COMBINATION OF PERCUTANEOUS (SCRATCH, PUNCTURE, PRICK) AND INTRACUTANEOUS (INTRADERMAL), SEQUENTIAL AND INCREMENTAL, WITH VENOMS, IMMEDIATE TYPE REACTION, INCLUDING TEST INTERPRETATION AND REPORT, SPECIFY NUMBER OF TESTS
Source: CMS coverage guidance
CPT 95024high
INTRACUTANEOUS (INTRADERMAL) TESTS WITH ALLERGENIC EXTRACTS, IMMEDIATE TYPE REACTION, INCLUDING TEST INTERPRETATION AND REPORT, SPECIFY NUMBER OF TESTS
Source: CMS coverage guidance
CPT 95004high
PERCUTANEOUS TESTS (SCRATCH, PUNCTURE, PRICK) WITH ALLERGENIC EXTRACTS, IMMEDIATE TYPE REACTION, INCLUDING TEST INTERPRETATION AND REPORT, SPECIFY NUMBER OF TESTS
Source: CMS coverage guidance

Coding guidelines

Common synonyms

Unspecified asthma, uncomplicated

Frequently asked questions

Code details

CodeJ45.909
SystemICD10
Display nameUnspecified asthma, uncomplicated
ChapterDiseases of the respiratory system (J00-J99)
BlockChronic lower respiratory diseases

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Asthma, asthmatic(bronchial) (catarrh) (spasmodic)Bronchitis(diffuse) (fibrinous) (hypostatic) (infective) (membranous)Dyspnea(nocturnal) (paroxysmal)Dyspnea(nocturnal) (paroxysmal)Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)IgE asthma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code J45.909 for Unspecified asthma, uncomplicated | HealthAssure