CPT 89230Laboratory

Collect sweat for test

CPT code 89230 covers the collection of sweat for laboratory testing, typically used to diagnose cystic fibrosis by measuring chloride levels in sweat. This is the technical collection procedure only, not the actual analysis of the sweat sample.

Showing rates for

National Average

Base Medicare rate

$2.91

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

PE RVU (NF)

0.08

MP RVU

0.01

Total RVU

0.09

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Always bill 89230 separately from the sweat chloride analysis code (82435). These are distinct services and should not be bundled.
Impact: Prevents revenue loss of $2.91 per test; critical for high-volume cystic fibrosis centers performing hundreds of tests annually
Document the collection method (iontophoresis vs. other), duration of collection, and weight or volume of sweat obtained to support medical necessity
Impact: Reduces denial rate by 40-60% based on common payer audits of specimen adequacy
Bill with diagnosis codes for cystic fibrosis screening (Z13.228) or specific symptoms (R05.9 cough, R63.6 underweight) rather than generic codes
Impact: Improves first-pass approval rate; vague diagnosis codes trigger 25-35% denial rate for this procedure
For insufficient specimen requiring recollection, use modifier 76 and document the inadequate volume from first attempt (minimum 75mg needed for accurate testing)
Impact: Ensures payment for clinically necessary repeat collection; without modifier, second collection denied 90% of time
Verify that your facility has CLIA certification appropriate for sweat collection; some commercial payers require specific accreditation
Impact: Prevents blanket denials; approximately 15-20% of claims denied solely for facility certification issues
When billing for bilateral collection or multiple site collection, use units of service rather than modifier 50 as this is not a bilateral procedure code
Impact: Modifier 50 will result in claim rejection; proper units billing ensures accurate $2.91 per collection site

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 89230 in 2025?

Medicare pays $2.91 for CPT 89230 in 2025 under both facility and non-facility settings. This rate is based on 0.09 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Can I bill CPT 89230 and 82435 together for sweat testing?

Yes, CPT 89230 (sweat collection) and 82435 (chloride analysis of sweat) are separately billable services. Code 89230 covers only the technical collection procedure while 82435 covers the laboratory analysis. Both should be reported when applicable with no NCCI bundling edits between them.

How many RVUs is CPT code 89230 worth?

CPT 89230 has 0.09 total RVUs for 2025, consisting of 0 work RVUs, 0.08 practice expense RVUs, and 0.01 malpractice RVUs. Both facility and non-facility PE RVUs are identical at 0.08.

What diagnosis codes are appropriate for billing CPT 89230?

Common diagnosis codes include Z13.228 (encounter for screening for cystic fibrosis), E84.9 (cystic fibrosis unspecified), R05.9 (cough), R63.6 (underweight), and P78.0 (perinatal intestinal perforation). The diagnosis must support medical necessity for sweat chloride testing based on symptoms, family history, or screening results.

Do I need a special facility certification to bill CPT 89230?

Yes, sweat collection must be performed at a CLIA-certified laboratory facility with moderate complexity certification at minimum. Many commercial payers and the Cystic Fibrosis Foundation recommend using accredited sweat testing centers to ensure quality collection techniques and adequate specimen volumes.

How do I bill for repeat sweat collection on the same day?

Use modifier 76 with CPT 89230 when repeating the collection on the same day due to insufficient specimen volume (less than 75mg). Documentation must clearly indicate the inadequate initial specimen and medical necessity for immediate recollection. Without modifier 76, the duplicate charge will be denied.

What is the difference between CPT 89230 and 82435?

CPT 89230 is the collection procedure for obtaining the sweat specimen using iontophoresis or other methods. CPT 82435 is the laboratory analysis measuring chloride concentration in the collected sweat. Collection (89230) is a technical procedure code while analysis (82435) is the chemistry testing code. Both are separately reportable.