CPT (Current Procedural Terminology) codes are five-digit numeric codes used to describe medical, surgical, and diagnostic services. They are maintained by the American Medical Association and used by healthcare providers, insurers, and Medicare for billing and reimbursement.

What is the difference between facility and non-facility rates?

Non-facility (office) rates are what Medicare pays when a service is performed in a physician's office. Facility rates are lower because when a service is performed in a hospital or ambulatory surgery center, the facility bills separately for overhead costs like equipment and supplies.

RVU stands for Relative Value Unit. Medicare uses RVUs to measure the value of physician services based on three components: physician work, practice expense, and malpractice cost. Total RVUs are multiplied by the conversion factor ($33.40 in 2026) to calculate the Medicare payment amount.

Is J45.909 a billable ICD-10-CM code?

Yes. J45.909 (Unspecified asthma, uncomplicated) is a billable/specific ICD-10-CM code and can be reported on a claim when the documentation supports it.

What procedures are commonly billed with J45.909?

Procedures frequently paired with J45.909 include 99214 (Office/outpatient visit, established patient, moderate complexity). The diagnosis must support medical necessity for the service billed.

ICD-10-CM · J00–J99Billable

ICD-10-CM Code J45.909

Unspecified asthma, uncomplicated

Source: CMS ICD-10-CM FY2026Effective October 1, 2025Reviewed by the D3rx Clinical Billing Team

Diagnosis information

Billable

Yes

Valid for claim submission

Chapter

J00–J99

Diseases of the respiratory system

Risk adjustment

None

Not risk-adjustable (V28)

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Procedures commonly billed with J45.909

CPT/HCPCS procedures frequently paired with J45.909 on claims. The diagnosis helps support medical necessity for the service, but documentation, the service performed, and payer/CMS policy all apply — link each line item to the diagnosis that best documents why it was needed.

99214Office/outpatient visit, established patient, moderate complexity

More codes in the J45 category

Other billable ICD-10-CM codes in the same category as J45.909. Coding to the highest specificity the documentation supports is what keeps a claim clean — pick the child code that most precisely matches the diagnosis.

J45.20Mild intermittent asthma, uncomplicated
J45.21Mild intermittent asthma with (acute) exacerbation
J45.22Mild intermittent asthma with status asthmaticus
J45.30Mild persistent asthma, uncomplicated
J45.31Mild persistent asthma with (acute) exacerbation
J45.32Mild persistent asthma with status asthmaticus
J45.40Moderate persistent asthma, uncomplicated
J45.41Moderate persistent asthma with (acute) exacerbation
J45.42Moderate persistent asthma with status asthmaticus
J45.50Severe persistent asthma, uncomplicated
J45.51Severe persistent asthma with (acute) exacerbation
J45.52Severe persistent asthma with status asthmaticus

Documentation & coding notes

J45.909 is a billable/specific ICD-10-CM code — it can be reported as a primary or secondary diagnosis when the documentation supports it. Code to the highest level of specificity the record allows.
Always verify the code against the current ICD-10-CM Official Guidelines and the payer's coverage policy before submitting — coverage, medical necessity edits, and sequencing rules vary by payer.

Related J00–J99 codes

J44.9 J06.9 J44.1 J45.40 J20.9 J02.9 J18.9 J96.01

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Medical coding disclaimer

ICD-10-CM codes and descriptions shown are from the CMS FY2026 official code set and HCC mappings from the CMS-HCC V28 model (payment year 2026), shown for educational reference. Official Guidelines, payer coverage, medical-necessity edits, and sequencing rules vary. Always verify with the current ICD-10-CM Official Guidelines and the payer before submitting claims. D3rx is not responsible for coding or billing outcomes.