I.y I - Interstitial/parenchymal lung disease
I.y - Progression, acceleration or exacerbation of preexisting ILD/fibrosis III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) III.c III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.c - Hemoptysis III.e III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.e - Pulmonary hematoma III.k III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.k - Epistaxis IV.af IV - Airway involvement
IV.af - Calcification of tracheobronchial cartilaginous rings V.e V - Pleural and/or pericardial involvement
V.e - Hemothorax - Serosanguineous pleural effusion V.n V - Pleural and/or pericardial involvement
V.n - Hemopericardium - Bloody pericardial effusion VII.g VII - Mediastinal involvement
VII.g - Hemomediastinum - Mediastinal hematoma VIII.a VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.a - Angioedema (may cause UAO, asphyxia and death) VIII.b VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.b - Hematoma of/around central airway wall potentially causing UAO VIII.q VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.q - Tongue involvement (edema, glossitis, hematoma) VIII.u VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.u - Vocal cord hematoma VIII.v VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.v - Retropharyngeal hematoma (may cause UAO) IX.x IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.x - Thoracic epidural or spinal hematoma X.a X - Systemic/Distant conditions, syndromes and reactions
X.a - DRES syndrome - DRESS-like reaction XI.k XI - Miscellaneous
XI.k - Esophageal hematoma (may cause chest pain and/or tracheal compression) XI.am XI - Miscellaneous
XI.am - Rectus abdominis hematoma XII.ar XII - Cardiovascular involvement / toxicity
XII.ar - Calcification of the coronary artery walls or atheroma XIX.d XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.d - BAL: Gross or microscopic bleeding/hemorrhage XIX.e XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.e - BAL: Stainable iron in macrophages XXIV.e XXIV - Veterinary medicine
XXIV.e - Veterinary: Tracheal hemorrhage, stenosis, collapse

I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.c I - Interstitial/parenchymal lung disease
I.c - Eosinophilic pneumonia (pulmonary infiltrates and eosinophilia) I.d I - Interstitial/parenchymal lung disease
I.d - Organizing pneumonia pattern (an area or areas of consolidation on imaging) I.e I - Interstitial/parenchymal lung disease
I.e - Acute eosinophilic pneumonia (AEP) I.j I - Interstitial/parenchymal lung disease
I.j - Exogenous lipoid pneumonia (subacute, acute) I.m I - Interstitial/parenchymal lung disease
I.m - ILD with a granulomatous component I.u I - Interstitial/parenchymal lung disease
I.u - Relapsing or migrating pneumonitis/pneumonia (see also Id) I.v I - Interstitial/parenchymal lung disease
I.v - Abnormal lung function/pulmonary physiology (PFTs) without necessarily imaging or clinical evidence I.aw I - Interstitial/parenchymal lung disease
I.aw - Persistent reduction in diffusing capacity for CO upon resolution of the adverse effect I.ax I - Interstitial/parenchymal lung disease
I.ax - Chronic pneumonitis II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury II.u II - Pulmonary edema - Acute lung injury - ARDS
II.u - Acute respiratory failure (e.g. from ARDS, ILD, PIE, OP, pulmonary edema or bronchospasm) requiring ECMO III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) III.c III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.c - Hemoptysis III.m III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.m - Coagulopathy IV.a IV - Airway involvement
IV.a - Bronchospasm - Wheezing - Asthma IV.d IV - Airway involvement
IV.d - Cough (lone) IV.f IV - Airway involvement
IV.f - Severe or catastrophic bronchospasm or asthma attack (can be fatal) IV.k IV - Airway involvement
IV.k - Bronchiectasis IV.n IV - Airway involvement
IV.n - Obstructive airway dysfunction (see also IVc, XVx) IV.p IV - Airway involvement
IV.p - Thermal, chemical or caustic airway injury IV.q IV - Airway involvement
IV.q - Reactive airway dysfunction syndrome (RADS) IV.t IV - Airway involvement
IV.t - Sptutum production - Bronchorrhea - 'Bronchitis' IV.v IV - Airway involvement
IV.v - Deterioration/exacerbation of preexisting asthma or COPD IV.ad IV - Airway involvement
IV.ad - Large airway inflammation - Tracheitis (w/wo tissue eosinophilia) V.a V - Pleural and/or pericardial involvement
V.a - Pleural effusion (uni- or bilateral) (can accompany DI-LDs) V.f V - Pleural and/or pericardial involvement
V.f - Pneumothorax VII.a VII - Mediastinal involvement
VII.a - Lymphadenopathy (intrathoracic) VII.e VII - Mediastinal involvement
VII.e - Granulomatous mediastinal lymphadenopathy VII.h VII - Mediastinal involvement
VII.h - Pneumomediastinum VIII.d VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.d - Thermal (burns, frostbite), chemical or caustic injury on the face, mouth, tongue, pharynx or upper airway VIII.al VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.al - Epiglottitis VIII.an VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.an - Facial/labial/buccal/oral/dental trauma VIII.ap VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.ap - Airway foreign body VIII.at VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.at - Gross tracheal inflammation on endoscopy IX.h IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.h - Dyspnea, unexplained otherwise IX.af IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.af - Seizures X.b X - Systemic/Distant conditions, syndromes and reactions
X.b - Antiphospholipid antibodies w/wo the APL syndrome X.k X - Systemic/Distant conditions, syndromes and reactions
X.k - Sarcoid-like granulomatosis (endo-/extrathoracic) X.aq X - Systemic/Distant conditions, syndromes and reactions
X.aq - Relapse or flare of preexisting ulcerative colitis XI.b XI - Miscellaneous
XI.b - Chest pain (acute or subacute), lone or prominent XI.r XI - Miscellaneous
XI.r - Death following exposure or poisoning XI.ac XI - Miscellaneous
XI.ac - Thermal skin/dermal injury XI.ay XI - Miscellaneous
XI.ay - Chest tightness XI.bc XI - Miscellaneous
XI.bc - Polycythemia XI.bd XI - Miscellaneous
XI.bd - Nicotine poisoning XI.be XI - Miscellaneous
XI.be - Burns XII.a XII - Cardiovascular involvement / toxicity
XII.a - Left or biventricular dysfunction/failure XII.l XII - Cardiovascular involvement / toxicity
XII.l - Cardiac arrhythmias or dysrhythmias (AF, VT, VF, TdP) XII.ag XII - Cardiovascular involvement / toxicity
XII.ag - Bradycardia XIV.a XIV - Hemoglobinopathies - Abnormal hemoglobin states (acquired)
XIV.a - Methemoglobinemia XV.c XV - Pathology
XV.c - Path: Organizing pneumonia (OP/BOOP) pattern (see also Id) XV.d XV - Pathology
XV.d - Path: Acute fibrinous organizing pneumonia (AFOP-pattern) (see also If) XV.e XV - Pathology
XV.e - Path: ILD with a granulomatous component (see also Im) XV.f XV - Pathology
XV.f - Path: Diffuse alveolar damage (DAD-pattern) (see also IL) XV.g XV - Pathology
XV.g - Path: Alveolar hemorrhage (see also IIIa) XV.p XV - Pathology
XV.p - Path: Exogenous lipoid pneumonia XV.x XV - Pathology
XV.x - Path: Acute/subacute bronchiolitis (see also IVc, IVi) XV.y XV - Pathology
XV.y - Path: Respiratory bronchiolitis (w/wo the RB-ILD-pattern) XV.ab XV - Pathology
XV.ab - Path: Pulmonary capillaritis XV.ba XV - Pathology
XV.ba - Path: Granulomatous lymphadenopathy XV.bi XV - Pathology
XV.bi - Path: Giant-cell interstitial pneumonia (GIP)-pattern XVI.a XVI - Imaging
XVI.a - Imaging: Diffuse haze XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing XVI.d XVI - Imaging
XVI.d - Imaging: Alveolar opacities or haze with a batwing or butterfly distribution XVI.g XVI - Imaging
XVI.g - Imaging: Diffuse whiteout/alveolar shadowing (see also under IIb-ARDS) XVI.k XVI - Imaging
XVI.k - Imaging: An area or areas of consolidation XVI.v XVI - Imaging
XVI.v - Imaging: Centrilobular micronodules (can be diffuse) XVI.af XVI - Imaging
XVI.af - Imaging: Lung cysts or bullae (see also XVI ah/bf) XVI.ai XVI - Imaging
XVI.ai - Imaging: A 'tree-in-bud' pattern XVI.bl XVI - Imaging
XVI.bl - Imaging: An area or areas of avid tracer uptake in the lung/chest on 18F-PET scan XVII.a XVII - Infections & related conditions
XVII.a - Respiratory tract infection incl. pneumonia XVII.c XVII - Infections & related conditions
XVII.c - Aspergillosis, pulmonary (invasive, allergic [ABPA], or mycetoma) XVII.h XVII - Infections & related conditions
XVII.h - Nontuberculous pulmonary mycobacterial infection/superinfection XVIII.x XVIII - Distinctive patterns - 'Eye-catchers'
XVIII.x - Eye catcher: A batwing pattern on imaging XIX.a XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.a - BAL: An excess proportion of lymphocytes XIX.b XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.b - BAL: An excess proportion of neutrophils XIX.c XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.c - BAL: An excess proportion of eosinophils XIX.d XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.d - BAL: Gross or microscopic bleeding/hemorrhage XIX.f XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.f - BAL: Foamy macrophages XIX.i XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.i - BAL: Oil red O-stainable material in BAL macrophages othen than exogenous lipids XIX.n XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.n - BAL: Brown-pigmented macrophages

I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.m I - Interstitial/parenchymal lung disease
I.m - ILD with a granulomatous component II.a II - Pulmonary edema - Acute lung injury - ARDS
II.a - Pulmonary edema, noncardiogenic (NCPE) II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury II.q II - Pulmonary edema - Acute lung injury - ARDS
II.q - Respiratory distress or failure, not otherwise specified III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) IV.c IV - Airway involvement
IV.c - Obliterative bronchiolitis (a pattern consistent with) (see also IVn, XVx) V.u V - Pleural and/or pericardial involvement
V.u - Eosinophilic pleuritis VI.a VI - Pulmonary vasculopathies
VI.a - Pulmonary embolism - Venous thrombosis/thromboembolism VI.b VI - Pulmonary vasculopathies
VI.b - Pulmonary arterial hypertension VIII.a VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.a - Angioedema (may cause UAO, asphyxia and death) VIII.c VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.c - Upper airway obstruction other than angioedema or hematoma VIII.w VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.w - Uvulitis, uvular edema IX.a IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.a - Diaphragm/inspiratory muscle weakness/paralysis (w/wo ARF) IX.d IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.d - Respiratory failure from ventilatory depression (due to neuromuscular blockade/paralysis) X.f X - Systemic/Distant conditions, syndromes and reactions
X.f - Anaphylaxis-Anaphylactoid reaction (can be fatal) X.u X - Systemic/Distant conditions, syndromes and reactions
X.u - Multiple organ dysfunction/failure (MODS/MOF) X.w X - Systemic/Distant conditions, syndromes and reactions
X.w - Eosinophilia myalgia syndrome (EMS) XI.b XI - Miscellaneous
XI.b - Chest pain (acute or subacute), lone or prominent XI.h XI - Miscellaneous
XI.h - Esophageal pathology (erosion, ulcer, tear, rupture, fistula) XI.r XI - Miscellaneous
XI.r - Death following exposure or poisoning XI.bi XI - Miscellaneous
XI.bi - Cyanide poisoning XII.d XII - Cardiovascular involvement / toxicity
XII.d - Myocarditis (can be fulminant) XII.f XII - Cardiovascular involvement / toxicity
XII.f - Cardiomyopathy (acute, subacute, chronic) XII.h XII - Cardiovascular involvement / toxicity
XII.h - Eosinophilic myocarditis XII.l XII - Cardiovascular involvement / toxicity
XII.l - Cardiac arrhythmias or dysrhythmias (AF, VT, VF, TdP) XII.m XII - Cardiovascular involvement / toxicity
XII.m - Cardiac- cardiorespiratory/pulmonary arrest XII.n XII - Cardiovascular involvement / toxicity
XII.n - Cardiovascular collapse - Cardiogenic shock - Hypotension XII.r XII - Cardiovascular involvement / toxicity
XII.r - Heart failure (biventricular, congestive) XII.w XII - Cardiovascular involvement / toxicity
XII.w - Asystole XII.ag XII - Cardiovascular involvement / toxicity
XII.ag - Bradycardia XII.ah XII - Cardiovascular involvement / toxicity
XII.ah - Tachycardia XII.ai XII - Cardiovascular involvement / toxicity
XII.ai - Cardiotoxicity XV.c XV - Pathology
XV.c - Path: Organizing pneumonia (OP/BOOP) pattern (see also Id) XV.f XV - Pathology
XV.f - Path: Diffuse alveolar damage (DAD-pattern) (see also IL) XV.z XV - Pathology
XV.z - Path: Obliterative (constrictive) bronchiolitis (see also IVc, IVn) XIX.d XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.d - BAL: Gross or microscopic bleeding/hemorrhage XXIV.i XXIV - Veterinary medicine
XXIV.i - Veterinary: Respiratory/Ventilatory depression XXIV.j XXIV - Veterinary medicine
XXIV.j - Veterinary: Cardiotoxicity

I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) V.b V - Pleural and/or pericardial involvement
V.b - Eosinophilic pleural effusion V.m V - Pleural and/or pericardial involvement
V.m - Pleuropericarditis - Pleuropericardial effusion (ANA unknown or negative) VI.a VI - Pulmonary vasculopathies
VI.a - Pulmonary embolism - Venous thrombosis/thromboembolism IX.d IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.d - Respiratory failure from ventilatory depression (due to neuromuscular blockade/paralysis) X.a X - Systemic/Distant conditions, syndromes and reactions
X.a - DRES syndrome - DRESS-like reaction X.b X - Systemic/Distant conditions, syndromes and reactions
X.b - Antiphospholipid antibodies w/wo the APL syndrome XIX.d XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.d - BAL: Gross or microscopic bleeding/hemorrhage

I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.k I - Interstitial/parenchymal lung disease
I.k - Lung nodule or nodules I.z I - Interstitial/parenchymal lung disease
I.z - An area or areas of consolidation I.al I - Interstitial/parenchymal lung disease
I.al - Silicone pneumonitis - 'Silicone lung' II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury II.u II - Pulmonary edema - Acute lung injury - ARDS
II.u - Acute respiratory failure (e.g. from ARDS, ILD, PIE, OP, pulmonary edema or bronchospasm) requiring ECMO III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) VI.m VI - Pulmonary vasculopathies
VI.m - Silicone pulmonary embolism (SE) - SE syndrome VII.k VII - Mediastinal involvement
VII.k - Mediastinal silicone infiltration/siliconoma VIII.k VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.k - Submucosal airway petechiae/hemorrhage X.u X - Systemic/Distant conditions, syndromes and reactions
X.u - Multiple organ dysfunction/failure (MODS/MOF) XI.b XI - Miscellaneous
XI.b - Chest pain (acute or subacute), lone or prominent XI.aa XI - Miscellaneous
XI.aa - CNS symptoms or involvement, stroke XI.bn XI - Miscellaneous
XI.bn - A restrictive lung function defect XI.bo XI - Miscellaneous
XI.bo - Parietal chest involvement XV.c XV - Pathology
XV.c - Path: Organizing pneumonia (OP/BOOP) pattern (see also Id) XV.f XV - Pathology
XV.f - Path: Diffuse alveolar damage (DAD-pattern) (see also IL) XV.g XV - Pathology
XV.g - Path: Alveolar hemorrhage (see also IIIa) XV.l XV - Pathology
XV.l - Path: Pulmonary fibrosis (not otherwise specified or unclassifiable) XV.bn XV - Pathology
XV.bn - Path: Silicone droplets/vacuoles in lung tissue, pulmonary vasculature, or lymph nodes XV.bo XV - Pathology
XV.bo - Path: Siliconoma XV.cw XV - Pathology
XV.cw - Path: Silicone pulmonary embolism XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing XVI.e XVI - Imaging
XVI.e - Imaging: Pulmonary opacities with a subpleural distribution XVI.k XVI - Imaging
XVI.k - Imaging: An area or areas of consolidation XVI.ax XVI - Imaging
XVI.ax - Imaging: Foreign body pulmonary embolism XVI.bh XVI - Imaging
XVI.bh - Imaging: F18-PET scan positive lympadenopathy XIX.d XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.d - BAL: Gross or microscopic bleeding/hemorrhage XIX.l XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.l - BAL: Silicone globules in macrophages