J67.7 ICD-10-CM Code: Air conditioner and humidifier lung
J67.7 maps to CMS-HCC V28 280. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the respiratory system (J00-J99) / Lung diseases due to external agents (J60-J70)
J67.7
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAir conditioner and humidifier lung
An allergic lung inflammation caused by inhaling contaminated water droplets or mold from air conditioning systems and humidifiers.
Buddy Insight
Air conditioner and humidifier lung is a form of hypersensitivity pneumonitis caused by contaminated water systems in HVAC equipment, making it one of the more commonly encountered hypersensitivity pneumonitis variants in non-agricultural settings.
CMS-HCC V28
MappedHCC 280
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 162
Code-level coefficient reference
ESRD/PACE
MappedHCC 112
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Allergic alveolitis due to fungal, thermophilic actinomycetes and other organisms growing in ventilation [air conditioning] systems
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from J00-J99, J60-J70
- certain infectious and parasitic diseases (A00-B99)Inherited from J00-J99, J60-J70
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from J00-J99, J60-J70
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from J00-J99, J60-J70
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from J00-J99, J60-J70
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from J00-J99, J60-J70
- neoplasms (C00-D49)Inherited from J00-J99, J60-J70
- smoke inhalation (T59.81-)Inherited from J00-J99, J60-J70
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from J00-J99, J60-J70
- asthma (J45.-)Inherited from J00-J99, J60-J70
- malignant neoplasm of bronchus and lung (C34.-)Inherited from J00-J99, J60-J70
Related Codes
Includes
Official- allergic alveolitis and pneumonitis due to inhaled organic dust and particles of fungal, actinomycetic or other originInherited from J67
Excludes 1
Official- pneumonitis due to inhalation of chemicals, gases, fumes or vapors (J68.0)Inherited from J67
Code First
OfficialNo Code First sequencing instructions are included in this display for J67.7. Check the code and parent instructions in the Code Book.
Use Additional
Official- code, where applicable, to identify:Inherited from J00-J99
- exposure to environmental tobacco smoke (Z77.22)Inherited from J00-J99
- exposure to tobacco smoke in the perinatal period (P96.81)Inherited from J00-J99
- history of tobacco dependence (Z87.891)Inherited from J00-J99
- occupational exposure to environmental tobacco smoke (Z57.31)Inherited from J00-J99
- tobacco dependence (F17.-)Inherited from J00-J99
- tobacco use (Z72.0)Inherited from J00-J99
Code Also
OfficialNo Code Also instructions are included in this display for J67.7. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is J67.7 an HCC code?
Yes. J67.7 (Air conditioner and humidifier lung) maps to HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.319. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: J67.7 is billable and maps to V28 HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- J67.7
- Description
- Air conditioner and humidifier lung
- HCC (V28)
- HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
- RAF reference coefficient
- 0.319
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work J67.7 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for J67.7
For J67.7, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
J67.7 is the ICD-10-CM diagnosis code for air conditioner and humidifier lung. An allergic lung inflammation caused by inhaling contaminated water droplets or mold from air conditioning systems and humidifiers. J67.7 sits in the ICD-10-CM chapter for diseases of the respiratory system (j00-j99), within the section covering lung diseases due to external agents (j60-j70).
Under the CMS-HCC V28 risk adjustment model, J67.7 maps to Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders (HCC 280) with a source-labeled community, non-dual, aged reference coefficient of 0.319. No V24 mapping is shown for J67.7; use the applicable model and payment year when reviewing the V28 mapping. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
Document exposure to contaminated air conditioning or humidifier systems. For J67.7, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J67.7 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document exposure to contaminated air conditioning or humidifier systems
- •Often associated with thermophilic actinomycetes or other microorganisms in water systems
Clinical Significance
Air conditioner and humidifier lung is a form of hypersensitivity pneumonitis caused by contaminated water systems in HVAC equipment, making it one of the more commonly encountered hypersensitivity pneumonitis variants in non-agricultural settings. It is significant for risk adjustment as a chronic respiratory condition that may affect multiple building occupants and requires environmental remediation in addition to medical treatment.
Documentation Requirements
- ✓Documentation of exposure to contaminated air conditioning, humidifier, or HVAC systems
- ✓Identification of the specific microorganism if available (thermophilic actinomycetes, Naegleria, etc.)
- ✓Temporal relationship between symptoms and building/HVAC exposure
- ✓Chest imaging and pulmonary function test results
- ✓Classification as acute, subacute, or chronic
- ✓Environmental assessment results if available
Commonly Confused Codes
- •J67.8 (Hypersensitivity pneumonitis due to other organic dusts): use J67.7 when contaminated HVAC systems are identified
- •J67.9 (Hypersensitivity pneumonitis due to unspecified organic dust): use J67.7 when the HVAC source is documented
- •J68.x (Respiratory conditions due to chemicals, gases, fumes): chemical irritant exposure, not microbial contamination
- •J67.0 (Farmer's lung): agricultural mold vs. indoor HVAC contamination