FY2027
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ICD-10 Code for Synovitis

The ICD-10-CM code for synovitis is M65.90 — Unspecified synovitis and tenosynovitis, unspecified site. This is the code the Alphabetic Index gives for synovitis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

BillableUnspecified

M65.90 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.

Which synovitis code should you use?

The Alphabetic Index lists 36 codes under Synovitis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

ankle and footM65.97Not billableUnspecified synovitis and tenosynovitis, ankle and foot
arm, upperM65.92Not billableUnspecified synovitis and tenosynovitis, upper arm
forearmM65.93Not billableUnspecified synovitis and tenosynovitis, forearm
gonococcalA54.49Gonococcal infection of other musculoskeletal tissue
handM65.94Not billableUnspecified synovitis and tenosynovitis, hand
leg, lowerM65.96Not billableUnspecified synovitis and tenosynovitis, lower leg
multiple sites, unspecified typeM65.99Unspecified synovitis and tenosynovitis, multiple sites
shoulderM65.91Not billableUnspecified synovitis and tenosynovitis, shoulder
specified site, unspecified typeM65.98Unspecified synovitis and tenosynovitis, other site
syphiliticA52.78Syphilis of other musculoskeletal tissue
thighM65.95Not billableUnspecified synovitis and tenosynovitis, thigh
transientM67.3Not billableTransient synovitis
villonodularM12.2Not billableVillonodular synovitis (pigmented)

Synovitis crepitant

handM70.04Not billableCrepitant synovitis (acute) (chronic), hand
wristM70.03Not billableCrepitant synovitis (acute) (chronic), wrist

Synovitis in

crystalsM65.8Not billableOther synovitis and tenosynovitis
gonorrheaA54.49Gonococcal infection of other musculoskeletal tissue
syphilisA52.78Syphilis of other musculoskeletal tissue

Synovitis syphilitic

congenitalA50.02Early congenital syphilitic osteochondropathy

Synovitis transient

ankleM67.37Not billableTransient synovitis, ankle and foot
elbowM67.32Not billableTransient synovitis, elbow
foot jointM67.37Not billableTransient synovitis, ankle and foot
hand jointM67.34Not billableTransient synovitis, hand
hipM67.35Not billableTransient synovitis, hip
kneeM67.36Not billableTransient synovitis, knee
multiple siteM67.39Transient synovitis, multiple sites
pelvic regionM67.35Not billableTransient synovitis, hip
shoulderM67.31Not billableTransient synovitis, shoulder
specified joint NECM67.38Transient synovitis, other site
wristM67.33Not billableTransient synovitis, wrist

Synovitis villonodular

ankleM12.27Not billableVillonodular synovitis (pigmented), ankle and foot
elbowM12.22Not billableVillonodular synovitis (pigmented), elbow
foot jointM12.27Not billableVillonodular synovitis (pigmented), ankle and foot
hand jointM12.24Not billableVillonodular synovitis (pigmented), hand
hipM12.25Not billableVillonodular synovitis (pigmented), hip
kneeM12.26Not billableVillonodular synovitis (pigmented), knee
multiple siteM12.29Villonodular synovitis (pigmented), multiple sites
pelvic regionM12.25Not billableVillonodular synovitis (pigmented), hip
shoulderM12.21Not billableVillonodular synovitis (pigmented), shoulder
specified joint NECM12.28Villonodular synovitis (pigmented), other specified site
vertebraeM12.28Villonodular synovitis (pigmented), other specified site
wristM12.23Not billableVillonodular synovitis (pigmented), wrist

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources