M54.42 Lumbago with sciatica, left side

Billable ICD-10-CM code, FY2026.

Applies from M54 Dorsalgia

Excludes1 (never code together)

• psychogenic dorsalgia (F45.41)

Applies from M54.4 Lumbago with sciatica

Excludes1 (never code together)

• intervertebral disc degeneration, lumbar region with discogenic back pain and lower extremity pain (M51.362)
• intervertebral disc degeneration, lumbosacral region with discogenic back pain and lower extremity pain (M51.372)
• lumbago with sciatica due to intervertebral disc disorder (M51.1-)

MS-DRG index

Defines the logic of DRG(s) 551-552 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 724.3 Sciatica (approximate)

Code annotations containing back-references to M54.42

Back-references to M54.4

• Type 1 Excludes: M54.3 Sciatica ("sciatica with lumbago (M54.4-)")
• Type 1 Excludes: M54.5 Low back pain ("lumbago with sciatica (M54.4-)")
• Type 1 Excludes: M79.2 Neuralgia and neuritis, unspecified ("sciatica (M54.3-M54.4)")

Back-references to M54

• Type 1 Excludes: G55 Nerve root and plexus compressions in diseases classified elsewhere ("nerve root compression (due to) (in) dorsopathies (M53.-, M54.-)")
• Type 2 Excludes: G89 Pain, not elsewhere classified ("spine pain (M54.-)")
• Type 2 Excludes: R10 Abdominal and pelvic pain ("dorsalgia (M54.-)")
• Type 1 Excludes: R52 Pain, unspecified ("spine pain (M54.-)")

Nearby codes

• M54.31 Sciatica, right side
• M54.32 Sciatica, left side
• M54.4 Lumbago with sciatica
• M54.40 Lumbago with sciatica, unspecified side
• M54.41 Lumbago with sciatica, right side
• M54.42 Lumbago with sciatica, left side (this code)
• M54.5 Low back pain
• M54.50 Low back pain, unspecified
• M54.51 Vertebrogenic low back pain
• M54.59 Other low back pain
• M54.6 Pain in thoracic spine