ICD-10-CM · Spine

M54.15

Radiculopathy localized to the thoracolumbar junction — the transitional zone where the lower thoracic spine meets the upper lumbar spine — producing nerve root irritation or compression with pain, sensory changes, or motor deficits radiating along the corresponding dermatomal distribution.

Verified May 8, 2026 · 6 sources ↓

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

Drawn from CDCICD10DataAAPCCMS

Documentation tips

What should appear in the chart to support M54.15.

Source · Editorial brief grounded in 6 cited references ↓

Specify 'thoracolumbar region' or the exact level (e.g., T12–L1) in the assessment — 'lower thoracic' or 'upper lumbar' alone may not map cleanly to M54.15 versus M54.14 or M54.16.
Document the neurological examination findings: dermatomal pain pattern, sensory deficits, motor weakness, and reflex changes that localize the root level.
Record imaging results (MRI, CT, or X-ray) and whether they show nerve root compression, disc pathology, or no structural finding — this determines whether M54.15 or an M51.1- or M47.2- code is correct.
If the cause is a disc disorder or spondylosis, document it explicitly; that shifts the code out of M54.15 entirely per the Tabular Excludes1 notes.
Note prior conservative treatments (PT, NSAIDs, activity modification) when documenting medical necessity for injections or advanced imaging.
For procedure coding alignment, confirm the injected or imaged level matches the documented radiculopathy region — a mismatch between T12–L1 procedure and a lumbar-only diagnosis is an audit trigger.

Related CPT procedures

Procedure codes commonly billed with M54.15. 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.

72110 $53.44

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

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.

97140 $27.72

Skilled, hands-on manual therapy techniques — including joint mobilization/manipulation, manual lymphatic drainage, and manual traction — applied to one or more body regions, billed per 15-minute unit.

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.

99215 $192.39

Highest-level office or outpatient E/M visit for an established patient, qualifying via high-complexity medical decision making or 40–54 minutes of total provider time on the date of service.

62323 View procedure details

62321 View procedure details

64483 View procedure details

64484 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M54.15 and adjacent codes.

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

Defaulting to M54.16 (lumbar radiculopathy) for T12–L1 level complaints — the thoracolumbar junction has its own code; use M54.15 when the provider documents that level.
Assigning M54.15 when imaging confirms the radiculopathy is caused by a disc disorder — that triggers M51.1- (radiculopathy with intervertebral disc disorder), making M54.15 an Excludes1 violation.
Using M54.15 when spondylosis is the documented etiology — that maps to M47.2- (spondylosis with radiculopathy), not M54.1-.
Pairing M54.15 with a procedure code for a pure lumbar ESI (CPT 62323) when the injection was performed at T12–L1 — the CPT for thoracic/thoracolumbar interlaminar ESI is 62321, not 62323.
Coding radiculopathy as M54.15 when the documentation only supports back pain without documented nerve root irritation — back pain at the thoracolumbar level without radicular features codes to M54.05 (panniculitis) or the appropriate dorsalgia code, not M54.15.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

M54.15 applies when the clinician documents radiculopathy at the thoracolumbar region — roughly the T12–L1 junction — without attributing it to a disc disorder, spondylosis, or other specifically codeable structural cause. If imaging confirms the radiculopathy originates from an intervertebral disc pathology, use M51.1- (radiculopathy with lumbar and other intervertebral disc disorder) instead. If spondylosis is the documented etiology, use M47.2- (spondylosis with radiculopathy). M54.15 is the correct code when radiculopathy at this level is documented as a primary or idiopathic finding, or when the underlying structural cause has not yet been confirmed.

The thoracolumbar junction is a biomechanically distinct transition zone and a less frequently coded radiculopathy site compared with pure lumbar (M54.16) or lumbosacral (M54.17) levels. Coders should not default to M54.16 for a T12–L1 level complaint — the physician's documentation of 'thoracolumbar' or a procedure note specifying T12–L1 is the controlling factor. A T12–L1 epidural steroid injection paired with M54.16 on the claim is a specificity mismatch that auditors flag.

M54.15 sits under parent M54.1 (Radiculopathy), which carries a Type 1 Excludes for radiculopathy with cervical disc disorder (M50.1-), radiculopathy with lumbar and other intervertebral disc disorder (M51.1-), and radiculopathy with spondylosis (M47.2-). Verify the documented etiology before assigning M54.15; those exclusions are hard stops, not coding preferences.

Sibling codes

Other billable codes under M54.1 (laterality / anatomic variants).

M54.17

Radiculopathy, lumbosacral region

M54.10

Radiculopathy, site unspecified

M54.12

Radiculopathy, cervical region

M54.13

Radiculopathy, cervicothoracic region

M54.16

Radiculopathy, lumbar region

M54.11

Radiculopathy, occipito-atlanto-axial region

M54.14

Radiculopathy, thoracic region

M54.18

Radiculopathy, sacral and sacrococcygeal region

Frequently asked questions

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

01What is the difference between M54.15 and M54.16?

M54.15 is radiculopathy at the thoracolumbar region (T12–L1 junction); M54.16 is radiculopathy at the lumbar region (L1–L5). Use the code that matches where the provider documented the radiculopathy originates — don't default to lumbar simply because the patient has low back symptoms.

02When should I use M51.1- instead of M54.15?

Use M51.1- (radiculopathy with lumbar and other intervertebral disc disorder) when the documentation explicitly attributes the radiculopathy to a disc herniation, bulge, or other disc pathology at the thoracolumbar level. M54.15 is an Excludes1 code in that scenario — you cannot bill both.

03Can M54.15 be used as a primary diagnosis for an epidural steroid injection at T12–L1?

Yes, M54.15 is a valid primary diagnosis to support medical necessity for a T12–L1 interlaminar ESI — but pair it with CPT 62321 (thoracic/thoracolumbar interlaminar ESI), not CPT 62323 (lumbar). Level and code must match.

04Is M54.15 valid for FY2026?

Yes. M54.15 is a billable, specific ICD-10-CM code effective October 1, 2025, under the FY2026 code set with no structural changes from prior years. It has been valid and billable since ICD-10-CM adoption in 2015.

05Does M54.15 require a 7th character?

No. M54.15 is an M-code under Chapter 13 (Musculoskeletal and Connective Tissue). The 7th-character extension convention (A/D/S) applies to injury S-codes and selected fracture M-codes like M48.4- and M80/M84, not to M54.1- radiculopathy codes.

06Can I code M54.15 alongside a chronic pain code?

Yes. If radiculopathy at the thoracolumbar level is chronic and the provider documents it as such, assign M54.15 as the primary diagnosis and G89.29 (Other chronic pain) as a secondary code to capture the chronic pain dimension — consistent with CMS guidance on layered pain coding.

07What imaging documentation supports M54.15 for payer medical necessity review?

MRI of the thoracic or thoracolumbar spine (CPT 72148 or 72158) is the gold standard. Document the radiologist's findings at T12–L1: nerve root compression, foraminal stenosis, disc protrusion, or, if unremarkable, that clinical radicular pattern drives the diagnosis. Either scenario is defensible; the absence of any imaging reference is the audit risk.

Sources & references

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

Mira AI Scribe

Mira AI Scribe captures the thoracolumbar level from the provider's assessment, the dermatomal pattern and neurological exam findings, imaging results referencing T12–L1 nerve root involvement, and any prior conservative care. That documentation prevents downgrade to unspecified dorsalgia, blocks a level-mismatch audit flag when a T12–L1 injection CPT is on the same claim, and keeps M54.15 defensible if a payer requests medical necessity review.

See how Mira captures M54.15 documentation