CPT 88311Laboratory

Decalcify tissue

CPT code 88311 covers the laboratory process of decalcifying tissue specimens—removing calcium deposits from bone or other calcified tissue samples so they can be properly cut and examined under a microscope.

Showing rates for

National Average

Base Medicare rate

$19.73

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

0.24

PE RVU (NF)

0.35

MP RVU

0.02

Total RVU

0.61

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

NCCI bundling edits

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Billing tips

Bill 88311 per specimen requiring decalcification, not per tissue block or per slide
Impact: Unit billing errors are a top audit trigger; correct unit reporting prevents $15-20 overpayment flags per excess unit
Verify payer-specific policies on whether decalcification is separately reportable or bundled into surgical pathology examination codes (88302-88309)
Impact: Many commercial payers bundle 88311 into surgical pathology globals; unbundling can delay payment 30-45 days or result in full denial
Document the specific decalcification method used (acid vs. chelating agent), duration of treatment, and clinical necessity in laboratory records
Impact: Inadequate documentation accounts for 40% of denials on appeal; complete records support medical necessity and prevent $19.73 write-offs
Do not bill 88311 for routine bone marrow specimens where decalcification is considered inherent to the bone marrow biopsy codes (88305 with bone marrow)
Impact: Improper billing with bone marrow procedures triggers NCCI edits resulting in 100% denial of the $19.73 charge
When multiple tissue specimens from the same patient require decalcification, verify each represents a distinct specimen with separate accessioning
Impact: Proper specimen tracking justifies multiple units; lack of distinct accession numbers risks recoupment of $19.73 per disputed unit
Review local coverage determinations (LCDs) as some Medicare contractors consider decalcification bundled unless specimen exceeds specific size or complexity thresholds
LCD non-compliance results in automatic denial; checking contractor policy prevents 100% of otherwise payable $19.73 charges from being rejected

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 88311 in 2025?

The 2025 Medicare national average reimbursement for CPT 88311 is $19.73 for both facility and non-facility settings, based on a total RVU of 0.61 and conversion factor of 32.3465.

Can CPT 88311 be billed with surgical pathology codes 88302-88309?

Yes, 88311 can be billed separately with surgical pathology examination codes when decalcification is performed and documented as a distinct laboratory procedure. However, many commercial payers bundle decalcification into the surgical pathology global fee, so verify payer-specific policies before billing.

How many times can you bill 88311 for a single patient encounter?

Bill 88311 once per specimen requiring decalcification. If a patient has multiple distinct specimens (each with separate accession numbers) that each require decalcification, you may bill multiple units corresponding to the number of specimens treated, not the number of tissue blocks or slides.

Is CPT 88311 a professional or technical component code?

CPT 88311 is a technical component only code representing the laboratory work of tissue decalcification. It has no professional component and should never be billed with modifier 26 or TC, as it is inherently a technical-only service.

What documentation is needed to support billing CPT 88311?

Required documentation includes the specimen accession number, tissue type requiring decalcification, specific decalcification method and duration, quality control verification, histotechnologist signature, and pathology report reference indicating the specimen type necessitated decalcification for proper microscopic examination.

Does Medicare always pay separately for tissue decalcification?

Medicare generally allows separate payment for 88311 when properly documented and medically necessary. However, some Medicare Administrative Contractors have local coverage determinations that may bundle decalcification into certain pathology services, so check your MAC's specific policies.

What is the work RVU for CPT code 88311?

The 2025 work RVU for CPT 88311 is 0.24, with practice expense RVU of 0.35 and malpractice RVU of 0.02, totaling 0.61 total RVUs. This relatively low RVU reflects the technical laboratory nature of the decalcification procedure.