ICD-10-CM · Spine

M54.13

Nerve root dysfunction at the junction where the cervical spine meets the thoracic spine (C7–T1), producing pain, sensory changes, or motor deficits that typically radiate into the upper extremity or chest wall.

Verified May 8, 2026 · 6 sources ↓

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

Drawn from CDCICD10DataCMSMedsolercmIcdcodes

Documentation tips

What should appear in the chart to support M54.13.

Source · Editorial brief grounded in 6 cited references ↓

Document the specific spinal region as 'cervicothoracic' or identify the involved level as C7–T1 to support M54.13 over unspecified M54.10.
Record the dermatomal distribution of symptoms (e.g., C8 dermatome — medial forearm, ring/small finger) to substantiate nerve root localization.
Note the results of provocative testing such as Spurling's test, upper limb tension test, or shoulder abduction relief sign, with positive or negative findings.
Document imaging findings (MRI or CT) with the specific level and findings: if disc herniation or spondylosis is confirmed at C7–T1, the code shifts to M50.13 or M47.2-; if imaging is negative or nonspecific, M54.13 remains appropriate.
Record any prior conservative treatment (physical therapy, NSAIDs, activity modification) if this encounter supports escalation of care or injection planning.
If pain management is the primary encounter purpose, consider whether a G89 code should lead or follow M54.13 per ICD-10-CM Section I.C.6 pain guidelines.

Related CPT procedures

Procedure codes commonly billed with M54.13. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

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.

72141 $190.72

MRI of the cervical spinal canal and its contents performed without contrast material.

72146 $190.39

MRI of the thoracic spinal canal and its contents performed without contrast material.

20552 $51.77

Injection(s) into one or two muscles for single or multiple trigger points at a single session.

95907 View procedure details

95908 View procedure details

64490 View procedure details

64493 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M54.13 and adjacent codes.

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

Assigning M54.13 when MRI confirms a herniated disc at C7–T1 — that requires M50.13, not M54.13; M54.1 parent category explicitly excludes disc-caused radiculopathy.
Defaulting to M54.10 (site unspecified) when the provider has documented 'cervicothoracic' — M54.13 is billable and specific; M54.10 invites payer scrutiny.
Confusing M54.12 (cervical region, C3–C6) with M54.13 (cervicothoracic, C7–T1) — the distinction turns on documented level and dermatomal pattern, not general 'neck pain.'
Using M54.13 when spondylosis is the documented cause — M47.2- codes spondylosis with radiculopathy and is the correct primary code in that scenario.
Billing M54.13 alongside M50.13 or M47.2- for the same encounter without recognizing that the M50/M47 codes subsume the radiculopathy component.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

M54.13 applies when radiculopathy is localized to the cervicothoracic junction — the C7–T1 spinal segment — and the cause is not a confirmed disc disorder or spondylosis. If imaging confirms a herniated disc is responsible, use M50.13 (cervical disc disorder with radiculopathy, cervicothoracic region) instead. If spondylosis is the documented etiology, use M47.2- with the appropriate regional subcode. M54.13 is the correct code when the radiculopathy is idiopathic, post-inflammatory, or the etiology has not yet been established.

Clinically, cervicothoracic radiculopathy at C7–T1 produces symptoms that may include pain radiating to the medial forearm and hand (C8 distribution), intrinsic hand muscle weakness, or sensory loss in the ring and small fingers. Distinguishing this region from pure cervical (M54.12) or thoracic (M54.14) radiculopathy depends on documented clinical localization — dermatomal pattern, positive Spurling's test at the lower cervical spine, and imaging level.

M54.13 sits within the M54.1 parent category, which explicitly excludes radiculopathy when a disc disorder (M50.1-, M51.1-) or spondylosis (M47.2-) is confirmed. Always verify the documented etiology before assigning M54.13 over those more specific codes. Do not use M54.10 (site unspecified) when the cervicothoracic region is documented.

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

M54.15

Radiculopathy, thoracolumbar 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 cervicothoracic region for coding purposes?

For ICD-10-CM M54.13, the cervicothoracic region corresponds to the C7–T1 junction. It is distinct from the cervical region (C3–C6, coded M54.12) and the thoracic region (coded M54.14). The provider's documented level or dermatomal pattern drives which code applies.

02When should I use M50.13 instead of M54.13?

Use M50.13 when imaging (typically MRI) confirms that a cervical disc disorder — herniation, degeneration with annular tear, or disc displacement — at the cervicothoracic level is causing the radiculopathy. M54.13 applies when the etiology is not a confirmed disc disorder.

03Can M54.13 and M50.13 be billed together on the same claim?

No. The M54.1 parent category excludes radiculopathy with cervical disc disorder (M50.1-). Assigning both codes for the same encounter and same level is a coding error. Select the more specific etiology-based code (M50.13) when disc pathology is confirmed.

04Does M54.13 require a seventh character?

No. M-codes in the dorsalgia category do not use seventh-character extensions. Seventh characters (A, D, S) apply to injury S-codes, not to M54.13.

05What imaging CPT codes pair with M54.13?

MRI cervical spine without contrast (72141) is the most common pairing for initial workup. MRI thoracic spine (72146) may be added when the thoracic level is also evaluated. Nerve conduction studies (95907, 95908) support functional localization of the root level.

06If the provider documents 'cervical radiculopathy' without specifying a level, which code applies?

Use M54.12 (cervical region) if documentation implies C3–C6 involvement, or M54.10 (site unspecified) if no level or region is documented. Query the provider before assigning M54.13, which requires explicit cervicothoracic or C7–T1 localization.

07Is M54.13 valid for physical therapy and injection billing, not just E/M visits?

Yes. M54.13 is a fully billable ICD-10-CM code appropriate as the primary diagnosis on claims for E/M, physical therapy, nerve conduction studies, and interventional procedures such as epidural steroid injections at the cervicothoracic level (CPT 64490 series).

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 documented spinal region (cervicothoracic or C7–T1 level), the dermatomal distribution of symptoms, Spurling's or tension test results, and imaging findings from the encounter note. This prevents a drop to unspecified M54.10, blocks incorrect assignment of M54.12, and flags when a confirmed disc finding at C7–T1 should redirect coding to M50.13.

See how Mira captures M54.13 documentation