ICD-10-CM · Spine

M48.05

Spinal stenosis occurring at the thoracolumbar junction — the transition zone between the thoracic and lumbar spine, roughly spanning the T10–L2 vertebral levels — where narrowing of the spinal canal compresses neural structures.

Verified May 8, 2026 · 6 sources ↓

Status: Billable
Chapter: 13
Related CPT: 20
Region: Spine

Drawn from CDCICD10DataAAPCHcmsusGesund

Documentation tips

What should appear in the chart to support M48.05.

Source · Editorial brief grounded in 6 cited references ↓

Specify the region by name in the clinical note — 'thoracolumbar junction' or 'T10-L2' — so the code selection is unambiguous and audit-defensible.
Include the imaging modality and report date (MRI or CT) that confirms canal narrowing at the thoracolumbar level; payers expect objective radiologic evidence.
Document neurological findings: presence or absence of radiculopathy, claudication, motor weakness, or sensory deficits in the lower extremities.
Record conservative treatment history (physical therapy, NSAIDs, epidural injections) before any surgical authorization request to establish medical necessity.
Note functional limitations — how far the patient can walk, whether symptoms are positional — to support medical necessity reviews and surgical consults.

Related CPT procedures

Procedure codes commonly billed with M48.05. 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.

72020 $23.71

Single-view radiologic examination of the spine at a specified level.

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.

72110 $53.44

Radiologic examination of the lumbar spine (lumbosacral) with a minimum of four views, including oblique and/or bending views.

72114 $61.79

Radiologic examination of the lumbosacral spine, complete series with bending (flexion/extension) views — minimum of 6 views total.

63001 $1,193.75

Posterior cervical laminectomy covering 1 or 2 vertebral segments, performed to decompress the spinal cord or cauda equina, without facetectomy, foraminotomy, or discectomy.

63045 $1,249.53

Open cervical laminectomy with facetectomy and foraminotomy at a single vertebral level to decompress nerve roots or the spinal cord.

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.

63048 $187.38

Add-on code for laminectomy, facetectomy, and foraminotomy at each additional cervical, thoracic, or lumbar vertebral segment beyond the primary segment.

63056 $1,404.84

Lumbar spinal cord and nerve root decompression via transpedicular approach, single segment, including transfacet or lateral extraforaminal variants for far lateral disc herniations.

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.

22630 $1,510.72

Posterior interbody arthrodesis of a single lumbar interspace, including laminectomy and/or discectomy performed to prepare the interspace for fusion rather than for decompression.

22800 $1,312.99

Posterior spinal arthrodesis for deformity correction spanning up to 6 vertebral segments, with or without application of a body cast.

72149 View procedure details

72131 View procedure details

72132 View procedure details

72133 View procedure details

63064 View procedure details

64493 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M48.05 and adjacent codes.

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

Using M48.05 when imaging shows stenosis in the lumbar region proper — lumbar stenosis requires M48.061 (without neurogenic claudication) or M48.062 (with neurogenic claudication), not M48.05.
Defaulting to M48.00 (site unspecified) when the provider's note and imaging report together support a specific region — unspecified codes invite payer downcoding and audit scrutiny.
Confusing the thoracolumbar region (M48.05) with the thoracic region (M48.04) or lumbosacral region (M48.07); let the imaging report define the apex of stenosis.
Attempting to add a 7th-character extension to M48.05 — this is an M-code with no 7th-character requirement; adding one will invalidate the claim.
Coding M99.7x or M99.5x (chiropractic/osteopathic subluxation stenosis) when the diagnosis is degenerative spinal stenosis documented by a physician and confirmed on imaging — M48.05 is the correct category for degenerative stenosis.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

M48.05 is the billable code for spinal stenosis localized to the thoracolumbar region. Use it when imaging (MRI or CT) confirms canal narrowing at the thoracolumbar junction and the provider's documentation explicitly identifies that region. This is a region-specific code: do not use it for stenosis documented as purely thoracic (M48.04), purely lumbar (M48.061/M48.062), or lumbosacral (M48.07).

The thoracolumbar junction is a biomechanical transition zone subject to degenerative and post-traumatic stenosis. Patients typically present with back pain, lower-extremity radiculopathy, neurogenic claudication, or — in advanced cases — foot drop. Symptoms may mimic lumbar stenosis; the imaging report is the deciding factor for code selection. Conservative management commonly precedes surgical referral, and documentation of that treatment history strengthens medical necessity for advanced imaging and procedural authorization.

M48.05 does not extend to a 6th character and carries no 7th-character extension requirement. It is a complete, billable 5-character code. Unlike the lumbar-region codes (M48.061/M48.062), there is no sub-distinction for neurogenic claudication at this level — if neurogenic claudication is the driving clinical finding and stenosis is confirmed in the lumbar region rather than the thoracolumbar junction, reassess laterality and level before finalizing the code.

Sibling codes

Other billable codes under M48.0 (laterality / anatomic variants).

M48.07

Spinal stenosis, lumbosacral region

M48.04

Spinal stenosis, thoracic region

M48.01

Spinal stenosis, occipito-atlanto-axial region

M48.02

Spinal stenosis, cervical region

M48.03

Spinal stenosis, cervicothoracic region

M48.08

Spinal stenosis, sacral and sacrococcygeal region

M48.00

Spinal stenosis, site unspecified

Frequently asked questions

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

01What distinguishes M48.05 from M48.04 (thoracic) and M48.06x (lumbar)?

M48.05 covers the thoracolumbar junction (approximately T10–L2), M48.04 covers the mid-thoracic region, and M48.06x covers the lumbar region proper. The imaging report's stated level of maximal stenosis drives the distinction — do not infer the region from symptoms alone.

02Does M48.05 require a 6th character or 7th-character extension?

No. M48.05 is a complete 5-character billable code. No 6th character and no 7th-character extension (A/D/S) are required or valid for this code.

03Should I also capture neurogenic claudication separately when coding M48.05?

Unlike M48.06, the thoracolumbar stenosis code has no sub-code for neurogenic claudication. Document the symptom in the note, but the ICD-10-CM tabular does not offer a M48.05-level distinction for claudication. Code the symptom separately if clinically significant and not integral to the stenosis diagnosis per payer guidance.

04Can M48.05 be used as a primary diagnosis on a surgical claim?

Yes, M48.05 is billable and can serve as the primary diagnosis on claims for decompression or fusion procedures at the thoracolumbar junction, provided the operative report and pre-op imaging tie the pathology to that region.

05What imaging CPT codes pair with M48.05 for diagnostic workup?

MRI thoracic spine without contrast (72148), with contrast (72149), or with and without contrast (72158) are the most common. CT of the thoracic or lumbar spine (72131–72133) is also appropriate when MRI is contraindicated. Order and document the study that covers the thoracolumbar junction specifically.

06Is laterality required for M48.05?

No. Spinal stenosis codes in the M48.0 family do not carry laterality designations — the 5th character specifies region, not side. This differs from many orthopedic codes where a right/left distinction is mandatory.

07When should I query the provider instead of defaulting to M48.05?

Query if the imaging report describes stenosis spanning both the thoracic and thoracolumbar regions, or if the note says 'thoracic/lumbar' without specifying the junction. The provider must clarify the primary level before you assign a region-specific code.

Sources & references

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

Mira AI Scribe

The Mira AI Scribe captures the provider's documented region of stenosis (thoracolumbar junction), the imaging modality and key findings (canal narrowing, degree of cord or cauda equina compression, Kellgren-Lawrence or equivalent grading), and any neurological symptoms tied to that level. This prevents the note from landing on M48.00 (site unspecified) or the wrong regional code — both of which trigger payer scrutiny and can delay or reduce reimbursement for associated procedures.

See how Mira captures M48.05 documentation