M70.42 Prepatellar bursitis, left knee

Billable ICD-10-CM code, FY2026.

Applies from M70 Soft tissue disorders related to use, overuse and pressure

Includes

• soft tissue disorders of occupational origin

Excludes1 (never code together)

• bursitis NOS (M71.9-)

Excludes2 (not included here)

• bursitis of shoulder (M75.5)
• enthesopathies (M76-M77)
• pressure ulcer (pressure area) (L89.-)

Use additional code

• external cause code to identify activity causing disorder (Y93.-)

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 726.65 Prepatellar bursitis (approximate)
• 727.2 Specific bursitides often of occupational origin (approximate)

Code annotations containing back-references to M70.42

Back-references to M70

• Type 1 Excludes: M65 Synovitis and tenosynovitis ("soft tissue disorders related to use, overuse and pressure (M70.-)")
• Type 1 Excludes: M71 Other bursopathies ("bursitis related to use, overuse or pressure (M70.-)")
• Type 2 Excludes: M76 Enthesopathies, lower limb, excluding foot ("bursitis due to use, overuse and pressure (M70.-)")
• Type 2 Excludes: M77 Other enthesopathies ("bursitis due to use, overuse and pressure (M70.-)")

Nearby codes

• M70.31 Other bursitis of elbow, right elbow
• M70.32 Other bursitis of elbow, left elbow
• M70.4 Prepatellar bursitis
• M70.40 Prepatellar bursitis, unspecified knee
• M70.41 Prepatellar bursitis, right knee
• M70.42 Prepatellar bursitis, left knee (this code)
• M70.5 Other bursitis of knee
• M70.50 Other bursitis of knee, unspecified knee
• M70.51 Other bursitis of knee, right knee
• M70.52 Other bursitis of knee, left knee
• M70.6 Trochanteric bursitis