CPT code 88313: Special stain, group II, tissue constituents2026 Medicare rate & RVUs in Napa, CA

In Napa, CA, Medicare pays $104.03 for 88313 in the office.

Check a contract rate as a % of Medicare · 88313 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 88313 covers

Group II histochemical stains highlight tissue components rather than infectious organisms. Examples include trichrome for fibrosis, Prussian blue for iron, reticulin for tissue architecture, elastic stains for vessel walls, and Congo red for amyloid. Histology staff prepare and stain slides, commonly from paraffin blocks, and a pathologist interprets the findings in the pathology report. These stains may be used on liver biopsies to assess fibrosis or iron, medical kidney biopsies to examine tissue architecture, and cardiac or fat pad biopsies to investigate amyloid.

Report one unit for each distinct Group II stain on each specimen, generally with the applicable tissue examination code, such as 88305 or 88307. The report should identify the specimen, stain, and result. Stains used to identify microorganisms belong in 88312; frozen-section histochemistry and enzyme histochemistry have separate codes. CMS prices the professional interpretation with modifier 26 and the technical preparation, reagents, and staff work with modifier TC. Billing without either modifier represents the global service. Physician work accounts for about 10% of the office total.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

How Napa, CA compares for 88313

Across 109 of 109 payment localities, the office rate for 88313 runs from $70.29 in Arkansas to $113.40 in San Benito County, CA. Napa, CA pays $104.03. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

88313 rates by state

Office rate range in each state. Select a state to see its payment localities.

See 88313 in every payment locality

How the 88313 rate is calculated

Each of 88313’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 88313

The CMS indicators that decide how 88313 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

Codes related to 88313

Related codes aren’t interchangeable: bill the code that matches the service performed.

How 88313 has changed in Napa, CA

Price 88313 for an earlier date of service

Where the Napa, CA rate applies

Napa, CA is a Medicare payment area, not a city. Our Census mapping connects it to 11 cities and communities in California. Some span more than one payment area; confirm with the service ZIP.

• Napa
• American Canyon
• Angwin
• Calistoga
• Deer Park
• Moskowite Corner
• Oakville
• Rutherford

Browse all communities in California

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates