ICD-10-CM · Spine

M51.06

M51.06 identifies a lumbar intervertebral disc disorder — herniation, degeneration, or prolapse — that has produced myelopathy: objective neurological dysfunction caused by spinal cord or cauda equina compression at the lumbar level.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 6
Region: Spine

Drawn from CDCICD10DataIcdcodesMdclarityAAPC

Documentation tips

What should appear in the chart to support M51.06.

Source · Editorial brief grounded in 5 cited references ↓

Record the specific lumbar level(s) involved (e.g., L3-L4, L4-L5, L5-S1) — the code itself doesn't require a 7th character for level, but level specificity supports medical necessity and surgical planning documentation.
Document myelopathy signs explicitly in the assessment: lower-extremity weakness, hyperreflexia, clonus, gait ataxia, or bowel/bladder dysfunction — not just radicular pain or paresthesia.
Cite MRI findings that confirm spinal cord or cauda equina compression: disc herniation size, degree of canal compromise, T2 signal change within the cord, and the affected vertebral segment.
If the patient underwent conservative treatment before surgery, document the duration, modalities attempted (physical therapy, epidural steroid injections, bracing), and failure to respond — insurers require this to establish surgical medical necessity.
Distinguish myelopathy from radiculopathy clearly in the clinical note. If both are present, assign M51.06 as the primary code; radiculopathy is subsumed when myelopathy is documented.

Related CPT procedures

Procedure codes commonly billed with M51.06. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

63030 $898.15

Single-interspace lumbar laminotomy with nerve root decompression, including partial facetectomy, foraminotomy, and/or herniated disc excision performed via open surgical technique.

63047 $1,065.49

Lumbar laminectomy at a single vertebral segment that also includes facetectomy and foraminotomy for decompression of the spinal cord, cauda equina, and/or nerve roots — unilateral or bilateral.

22612 $1,467.64

Posterior or posterolateral lumbar arthrodesis of a single interspace, performed via a posterior approach with bone graft and typically pedicle screw fixation to achieve vertebral segment fusion.

22842 $680.04

Posterior segmental spinal instrumentation spanning 3 to 6 vertebral segments, reported as an add-on to the primary spinal procedure code.

22853 $228.80

Add-on code for inserting an interbody biomechanical device (e.g., synthetic cage or mesh) with integral anterior anchoring instrumentation into an intervertebral disc space, performed alongside interbody arthrodesis, reported once per interspace.

22558 $1,423.88

Anterior interbody arthrodesis of the lumbar spine using an anterior or anterolateral approach, including the minimal discectomy required to prepare the interspace for fusion.

Common coding pitfalls

The recurring mistakes coders make with M51.06 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

Assigning M51.06 for radiculopathy alone — leg pain, sciatica, or dermatomal numbness without objective cord signs does not meet the myelopathy threshold; use M51.16 or M51.26 instead.
Using M51.06 when imaging shows cord compression but the clinical note lacks documented neurological deficits — myelopathy requires both structural compression and functional neurological impairment; imaging alone is insufficient.
Confusing M51.06 (lumbar myelopathy) with M51.05 (thoracolumbar) when the disc pathology spans the thoracolumbar junction — assign M51.05 for thoracolumbar, M51.06 only when the affected level is strictly lumbar.
Failing to prioritize M51.06 over a radiculopathy code when both conditions are documented — per coding guidance, myelopathy takes precedence over radiculopathy codes when both are present at the same level.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Use M51.06 when a lumbar disc pathology (herniation, prolapse, or degeneration) has caused myelopathy — meaning documented spinal cord or cauda equina compromise with functional neurological deficits such as lower-extremity weakness, gait disturbance, or bowel/bladder dysfunction. MRI evidence of cord or cauda equina compression is the standard clinical anchor for this code. Radiculopathy alone does not qualify; if the patient has only radiating leg pain or dermatomal sensory loss without cord-level signs, use M51.16 (displacement with radiculopathy, lumbar) or M51.26 (other displacement, lumbar) instead.

M51.06 sits under parent code M51.0 (thoracic, thoracolumbar, and lumbosacral disc disorders with myelopathy). Adjacent codes M51.05 (thoracolumbar) and M51.04 (thoracic) cover higher regions — confirm the documented level is lumbar before assigning M51.06. Because true lumbar myelopathy is a high-acuity presentation, this code commonly appears alongside surgical procedure codes for decompression (laminotomy, laminectomy) or stabilization (arthrodesis, instrumentation).

For DRG assignment, M51.06 maps to MS-DRG 551 (Medical back problems with MCC) or 552 (without MCC) under MS-DRG v43.0. If myelopathy is the principal diagnosis driving an inpatient surgical admission, the DRG will shift to a surgical group based on the procedure performed. Code myelopathy as the principal diagnosis when it is the condition chiefly responsible for the admission, per ICD-10-CM Official Guidelines Section II.

Sibling codes

Other billable codes under M51.0 (laterality / anatomic variants).

M51.04

Intervertebral disc disorders w myelopathy, thoracic region

M51.05

Intvrt disc disorders w myelopathy, thoracolumbar region

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01What is the difference between M51.06 and M51.16?

M51.06 requires documented myelopathy — objective neurological dysfunction from cord or cauda equina compression (weakness, gait disturbance, bowel/bladder changes). M51.16 covers lumbar disc displacement with radiculopathy — radiating pain, dermatomal sensory loss, or reflex change without cord-level signs. Myelopathy is the higher-acuity diagnosis and takes priority when both are documented.

02Can M51.06 and M51.16 be coded together on the same claim?

Generally no — when myelopathy is present, it subsumes radiculopathy at the same level. Assign M51.06 as the primary code. If radiculopathy is documented at a separate, distinct level, coding both may be defensible, but confirm with your payer's LCD and the ICD-10-CM Official Guidelines.

03Is MRI required to support M51.06?

MRI is the standard imaging modality used to confirm disc-level cord or cauda equina compression and is expected by payers and auditors. A CT myelogram is an acceptable alternative. Clinical documentation of myelopathy signs alone, without supporting imaging, creates significant audit risk.

04Which surgical CPT codes pair with M51.06?

Common pairings include 63030 (laminotomy with nerve root decompression, one interspace, lumbar), 63047 (laminectomy with decompression, lumbar), 22612 (posterior arthrodesis, lumbar), 22842 (posterior segmental instrumentation), 22853 (interbody device insertion, lumbar), and 22558 (anterior interbody arthrodesis, lumbar). Confirm the specific procedure documented before assigning.

05What DRG does M51.06 map to for inpatient encounters?

Under MS-DRG v43.0, M51.06 maps to DRG 551 (Medical back problems with MCC) or DRG 552 (without MCC) for medical admissions. When a surgical procedure is performed, the DRG shifts to the applicable surgical grouping based on the procedure code.

06Does M51.06 apply to cauda equina syndrome?

Cauda equina syndrome from disc compression can be coded with M51.06, but verify whether G83.4 (Cauda equina syndrome) should be assigned as a principal or additional code. Per ICD-10-CM convention, code the underlying disc disorder and the neurological manifestation; sequencing depends on the reason for the encounter.

07Should the lumbar disc level (e.g., L4-L5) be coded separately?

M51.06 does not have additional characters to specify the exact disc level — L3-L4, L4-L5, L5-S1 distinctions are not captured at the ICD-10-CM code level. Document the level in the clinical note for surgical and audit purposes, but no additional ICD-10-CM code is needed solely to specify level.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

01CDC ICD-10-CM Tabular List 2026 (effective October 1, 2025)
02
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M50-M54/M51-/M51.06
03
icdcodes.ai
https://icdcodes.ai/diagnosis/lumbosacral-disc-herniation/documentation
04
mdclarity.com
https://www.mdclarity.com/icd-codes/m51-06
05
aapc.com
https://www.aapc.com/codes/icd-10-codes/M51.06

Mira AI Scribe

Mira AI Scribe captures the clinical elements that lock in M51.06: the specific lumbar disc level, MRI findings showing cord or cauda equina compression, and objective neurological deficits (weakness grade, reflex changes, gait assessment, bowel/bladder status). Documenting these in the encounter note prevents downcode to a radiculopathy code and closes the audit gap that payers exploit when myelopathy is asserted without functional neurological findings.

See how Mira captures M51.06 documentation