ICD-10-CM · Spine

M51.87

Intervertebral disc disorder of the lumbosacral region (L5-S1 level) that does not fall into a more specific subcategory such as displacement, degeneration, radiculopathy, or Schmorl's nodes — including conditions like disc calcification at that level.

Verified May 8, 2026 · 6 sources ↓

Status: Billable
Chapter: 13
Related CPT: 10
Region: Spine

Drawn from CDCICD10DataAAPCCMS

Documentation tips

What should appear in the chart to support M51.87.

Source · Editorial brief grounded in 6 cited references ↓

Specify the exact region as 'lumbosacral' or 'L5-S1' — generic 'lumbar spine' language defaults to M51.86, not M51.87.
If imaging shows disc calcification at L5-S1, name it explicitly; that finding is the primary mapped synonym for this code.
Document why more specific codes (displacement, degeneration, radiculopathy) were not assigned — e.g., 'calcification without herniation or neural compression.'
Include MRI or CT findings: disc signal change, end-plate calcification, disc height loss, or other structural descriptors that validate the 'other disorder' characterization.
Record symptom onset, duration, and any prior conservative treatment (physical therapy, injections) to support medical necessity for higher-level interventions billed alongside this code.
If neurological symptoms are present, evaluate whether M51.17 (radiculopathy, lumbosacral) is more accurate before defaulting to M51.87.

Related CPT procedures

Procedure codes commonly billed with M51.87. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

72148 $191.72

Non-contrast MRI of the lumbar spine used to evaluate disc pathology, spinal stenosis, nerve root compression, and other structural abnormalities without administration of contrast material.

72158 $318.31

MRI of the lumbar spinal canal and its contents performed first without contrast, then repeated after contrast administration for enhanced visualization.

72100 $40.42

Radiologic examination of the lumbosacral spine capturing two or three views, used to evaluate the lumbar vertebrae and sacrum for injury, degeneration, or structural abnormality.

97110 $29.06

Therapeutic exercise billed per 15-minute unit, targeting strength, endurance, range of motion, or flexibility with direct one-on-one patient contact.

99213 $95.19

Established patient office or outpatient visit requiring 20–29 minutes of total time or low-complexity medical decision-making.

99214 $135.61

Office visit for an established patient requiring moderate-complexity medical decision making (MDM), or 30–39 minutes of total provider time on the date of service.

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.

62290 View procedure details

62291 View procedure details

97530 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M51.87 and adjacent codes.

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

Using M51.87 when M51.37x (degeneration) or M51.17 (radiculopathy) is supported by documentation — 'other' codes should be last resort, not default.
Confusing the lumbosacral region (L5-S1) with the lumbar region (L1-L5); those map to M51.86 and require distinct documentation.
Assigning M51.87 from an MRI read alone without provider diagnostic documentation linking the imaging finding to this specific code.
Defaulting to M51.9 (unspecified) when the chart does identify a region — M51.9 is only appropriate when region is truly undocumented.
Overlapping M51.87 with annulus fibrosus defect codes (M51.A3–M51.A5, lumbosacral) introduced in recent code years; verify the tabular excludes notes before stacking these.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

M51.87 is the residual 'other' code for lumbosacral disc pathology that cannot be coded more precisely within the M51 block. Its most documented approximate synonym is calcification of the intervertebral disc at the lumbar or lumbosacral level. Use it only after ruling out more specific codes: M51.27 (displacement), M51.37x (degeneration — now subdivided by symptom pattern), M51.17 (radiculopathy), and M51.47 (Schmorl's nodes), all of which carry greater clinical specificity and should be preferred when documentation supports them.

The lumbosacral region in ICD-10-CM refers specifically to the L5-S1 articulation and disc space. Do not conflate this with the lumbar region (L1-L5), which maps to M51.86. If the provider documents pathology broadly across lumbar levels without isolating L5-S1, M51.86 is the correct pick unless the chart specifically calls out lumbosacral or L5-S1 involvement.

M51.87 groups into MS-DRG 551 (Medical back problems with MCC) and 552 (without MCC) under v43.0. The code appears on the CMS NCD-supporting code list for nerve conduction studies and electromyography (A56619), meaning it can support medical necessity for electrodiagnostic workup when lumbosacral disc pathology is the documented etiology of neurological symptoms.

Sibling codes

Other billable codes under M51.8 (laterality / anatomic variants).

M51.86

Other intervertebral disc disorders, lumbar region

M51.84

Other intervertebral disc disorders, thoracic region

M51.85

Other intervertebral disc disorders, thoracolumbar region

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01What distinguishes M51.87 from M51.86?

Region. M51.87 = lumbosacral (L5-S1); M51.86 = lumbar (L1-L5). The provider must document which level is affected. If the note says only 'lumbar,' use M51.86.

02Can M51.87 be used for disc calcification at L5-S1?

Yes. Calcification of the intervertebral disc at the lumbosacral level is the primary approximate synonym mapped to M51.87 in the ICD-10-CM index.

03Should I use M51.87 or M51.37 when the MRI shows lumbosacral disc degeneration?

Use M51.37x (now expanded with symptom-based 5th characters for FY2024+) when the provider documents degeneration. M51.87 is for disc disorders at that level that are neither degeneration, displacement, radiculopathy, nor Schmorl's nodes.

04Does M51.87 support medical necessity for an MRI of the lumbar spine?

It can, but payers expect the code to reflect a documented clinical diagnosis, not a fishing expedition. Pair it with a symptom code if the disc pathology is suspected but not yet confirmed on imaging.

05Is M51.87 valid for nerve conduction study (NCS) billing under CMS policy?

Yes. CMS LCD article A56619 lists M51.87 as a code that supports medical necessity for nerve conduction studies and EMG when lumbosacral disc pathology is the documented basis for neurological evaluation.

06What MS-DRG does M51.87 map to for inpatient encounters?

MS-DRG 551 (Medical back problems with MCC) or 552 (without MCC) under MS-DRG v43.0, the same grouping as other non-surgical lumbar disc disorder codes.

07Can M51.87 be coded alongside a radiculopathy code?

Generally no — if radiculopathy is present at the lumbosacral level, M51.17 is the correct primary code. Stacking M51.87 and M51.17 for the same level is redundant and may trigger an audit flag.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures the precise spinal level (lumbosacral / L5-S1), the nature of the disc pathology (e.g., calcification, unclassified structural change), relevant imaging findings from MRI or CT, and the absence of radiculopathy or frank herniation — all elements needed to justify M51.87 over a more specific M51 subcategory. Accurate capture prevents downcoding to unspecified M51.9 or miscoding to the lumbar M51.86, both of which can trigger payer scrutiny.

See how Mira captures M51.87 documentation