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ICD-10 Code J44.9: Chronic obstructive pulmonary disease, unspecified

J44.9 is a billable ICD-10 diagnosis code used to classify Chronic obstructive pulmonary disease, unspecified 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 chronic obstructive pulmonary disease, unspecified 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
J44Other chronic obstructive pulmonary disease
currentJ44

Official coding notes

Inclusion terms
  • Chronic obstructive airway disease NOS
  • Chronic obstructive lung disease 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 COPD evaluation and follow-up.
Arterial blood gas
May be relevant in selected COPD cases when oxygenation or ventilation is being assessed.

Related procedures

Nebulizer treatment
May appear in symptomatic COPD care pathways.
Pulmonary rehabilitation
Commonly part of longer-term COPD management pathways.

Coverage-related procedures and services

CPT 87801high
INFECTIOUS AGENT DETECTION BY NUCLEIC ACID (DNA OR RNA), MULTIPLE ORGANISMS; AMPLIFIED PROBE(S) TECHNIQUE
Source: CMS coverage guidance
CPT 87633high
INFECTIOUS AGENT DETECTION BY NUCLEIC ACID (DNA OR RNA); RESPIRATORY VIRUS (EG, ADENOVIRUS, INFLUENZA VIRUS, CORONAVIRUS, METAPNEUMOVIRUS, PARAINFLUENZA VIRUS, RESPIRATORY SYNCYTIAL VIRUS, RHINOVIRUS), INCLUDES MULTIPLEX REVERSE TRANSCRIPTION, WHEN PERFORMED, AND MULTIPLEX AMPLIFIED PROBE TECHNIQUE, MULTIPLE TYPES OR SUBTYPES, 12-25 TARGETS
Source: CMS coverage guidance
CPT 87632high
INFECTIOUS AGENT DETECTION BY NUCLEIC ACID (DNA OR RNA); RESPIRATORY VIRUS (EG, ADENOVIRUS, INFLUENZA VIRUS, CORONAVIRUS, METAPNEUMOVIRUS, PARAINFLUENZA VIRUS, RESPIRATORY SYNCYTIAL VIRUS, RHINOVIRUS), INCLUDES MULTIPLEX REVERSE TRANSCRIPTION, WHEN PERFORMED, AND MULTIPLEX AMPLIFIED PROBE TECHNIQUE, MULTIPLE TYPES OR SUBTYPES, 6-11 TARGETS
Source: CMS coverage guidance
CPT 0564Uhigh
INFECTIOUS DISEASE (BACTERIAL AND/OR VIRAL RESPIRATORY TRACT INFECTION), PATHOGEN-SPECIFIC NUCLEIC ACID (DNA OR RNA), 10 VIRAL TARGETS AND 4 BACTERIAL TARGETS, QUALITATIVE RT-PCR, UPPER RESPIRATORY SPECIMEN, EACH PATHOGEN REPORTED AS POSITIVE OR NEGATIVE
Source: CMS coverage guidance
CPT 0563Uhigh
INFECTIOUS DISEASE (BACTERIAL AND/OR VIRAL RESPIRATORY TRACT INFECTION), PATHOGEN-SPECIFIC NUCLEIC ACID (DNA OR RNA), 11 VIRAL TARGETS AND 4 BACTERIAL TARGETS, QUALITATIVE RT-PCR, UPPER RESPIRATORY SPECIMEN, EACH PATHOGEN REPORTED AS POSITIVE OR NEGATIVE
Source: CMS coverage guidance
CPT 0225Uhigh
INFECTIOUS DISEASE (BACTERIAL OR VIRAL RESPIRATORY TRACT INFECTION) PATHOGEN-SPECIFIC DNA AND RNA, 21 TARGETS, INCLUDING SEVERE ACUTE RESPIRATORY SYNDROME CORONAVIRUS 2 (SARS-COV-2), AMPLIFIED PROBE TECHNIQUE, INCLUDING MULTIPLEX REVERSE TRANSCRIPTION FOR RNA TARGETS, EACH ANALYTE REPORTED AS DETECTED OR NOT DETECTED
Source: CMS coverage guidance

Mapped diagnoses and classifications

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
J44.9

Common synonyms

Chronic obstructive pulmonary disease, unspecifiedChronic obstructive pulmonary disease

Frequently asked questions

Code details

CodeJ44.9
SystemICD10
Display nameChronic obstructive pulmonary disease, unspecified
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
Disease, diseasedDisease, diseasedDisease, diseasedObstruction, obstructed, obstructiveObstruction, obstructed, obstructiveObstruction, obstructed, obstructive

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 J44.9 for Chronic obstructive pulmonary disease, unspecified | HealthAssure