ICD-10-CM · Spine

M41.03

Infantile idiopathic scoliosis localized to the cervicothoracic region (the junction of the cervical and thoracic spine), diagnosed in children from birth through 3 years of age with no identified structural or congenital cause.

Verified May 8, 2026 · 6 sources ↓

Status: Billable
Chapter: 13
Related CPT: 15
Region: Spine

Drawn from CDCICD10DataAAPCClear-instituteOutsourcestrategies

Documentation tips

What should appear in the chart to support M41.03.

Source · Editorial brief grounded in 6 cited references ↓

Record the age at initial diagnosis explicitly — this determines whether M41.0x (infantile), M41.11x (juvenile), or M41.12x (adolescent) applies, regardless of the patient's current age.
Identify the end vertebrae used to measure the Cobb angle so the cervicothoracic region assignment (vs. cervical M41.02 or thoracic M41.04) is unambiguously supported in the record.
State the Cobb angle measurement and imaging modality (e.g., full-spine PA radiograph) — payers and auditors expect objective imaging data to substantiate a specific spine deformity diagnosis.
Document that no congenital bony malformation (hemivertebra, unsegmented bar) or identifiable etiology was identified; this distinguishes idiopathic from congenital scoliosis requiring Q76.3 or Q67.5.
Note the sex of the patient — infantile idiopathic scoliosis has a male predominance, and this clinical detail supports diagnosis plausibility in an audit.

Related CPT procedures

Procedure codes commonly billed with M41.03. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

22800 $1,312.99

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

22802 $1,936.25

Posterior spinal arthrodesis for deformity correction spanning 7 to 12 vertebral segments, with or without body cast application.

22804 $2,222.50

Posterior spinal arthrodesis for deformity correction spanning 13 or more vertebral segments, performed with or without application of a body cast.

22808 $1,754.55

Anterior spinal arthrodesis for deformity correction spanning 2 to 3 vertebral segments, performed with or without cast application.

22810 $1,795.97

Anterior spinal arthrodesis for deformity correction spanning 4 to 7 vertebral segments, including minimal discectomy to prepare each interspace.

22812 $1,970.99

Anterior spinal arthrodesis for deformity correction spanning eight or more vertebral segments, with or without cast application.

22818 $1,911.87

Kyphectomy involving circumferential spinal exposure and full resection of one or two vertebral segments, including both the vertebral body and posterior elements.

22819 $2,201.79

Kyphectomy with circumferential spinal exposure and full resection of three or more vertebral segments, including vertebral body and posterior elements.

72020 $23.71

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

72040 $39.75

Radiologic examination of the cervical spine capturing two or three views (e.g., AP, lateral, oblique).

72070 $33.07

Two-view radiologic examination of the thoracic spine, including AP and lateral projections of the 12 thoracic vertebrae.

20610 $68.81

Aspiration and/or injection of a major joint or bursa (shoulder, hip, knee, or subacromial bursa) performed without ultrasound guidance.

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.

72072 View procedure details

72074 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M41.03 and adjacent codes.

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

Upcoding to a juvenile or adolescent code (M41.11x, M41.12x) when the patient is now older but was originally diagnosed under age 3 — the code follows the age at diagnosis, not the current visit.
Using M41.03 when a congenital vertebral anomaly (hemivertebra) is present — that scenario requires Q76.3, not an idiopathic code.
Defaulting to M41.00 (site unspecified) when imaging clearly localizes the curve to the cervicothoracic region — M41.03 is the billable-specific code and should always be used when the region is documented.
Confusing cervicothoracic (M41.03) with cervical (M41.02) or thoracic (M41.04) — confirm which vertebral levels define the curve's end points before selecting the regional code.
Applying postprocedural scoliosis code M96.89 to a patient with pre-existing infantile idiopathic scoliosis who later has spine surgery — M41.03 remains appropriate if the curve predates the procedure.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

M41.03 is the correct code when a child age 0–3 presents with idiopathic lateral spinal curvature whose apex or measured curve spans the cervicothoracic junction — typically C7 through T1 or T2. 'Idiopathic' means no congenital bony malformation, neuromuscular disease, or other identifiable etiology has been found. If a hemivertebra or other structural anomaly is present, code Q76.3 instead.

Critically, the ICD-10-CM classification for idiopathic scoliosis is determined by the age at initial diagnosis, not the age at the current encounter. A 12-year-old whose infantile scoliosis was diagnosed at age 2 and never resolved still carries M41.03, not a juvenile or adolescent code. Document the original diagnosis date explicitly to support this assignment.

The cervicothoracic designation reflects where the curve's primary segment lies, typically defined by the end vertebrae used to calculate the Cobb angle. A curve measured from C5 to T3, for example, would be cervicothoracic. If the curve is entirely within the cervical spine, use M41.02; if it drops into the thoracic region proper, use M41.04. Exclude postprocedural scoliosis (M96.89) and postradiation scoliosis (M96.5), which have their own codes regardless of patient age.

Sibling codes

Other billable codes under M41.0 (laterality / anatomic variants).

M41.05

Infantile idiopathic scoliosis, thoracolumbar region

M41.04

Infantile idiopathic scoliosis, thoracic region

M41.06

Infantile idiopathic scoliosis, lumbar region

M41.08

Infantile idiopathic scoliosis, sacr/sacrocygl region

M41.02

Infantile idiopathic scoliosis, cervical region

M41.00

Infantile idiopathic scoliosis, site unspecified

M41.07

Infantile idiopathic scoliosis, lumbosacral region

Frequently asked questions

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

01What age range defines 'infantile' idiopathic scoliosis for coding purposes?

Infantile idiopathic scoliosis (M41.0x) is defined as scoliosis first diagnosed from birth through 3 years of age. Juvenile onset is ages 3–9; adolescent onset is 10 through skeletal maturity. The classification follows the age at initial diagnosis, not the current encounter date.

02What defines the 'cervicothoracic region' for scoliosis coding?

The cervicothoracic region refers to the junction zone of the cervical and thoracic spine, generally C7–T1/T2. For scoliosis, it reflects the spinal segment defined by the end vertebrae used to calculate the Cobb angle. If both end vertebrae are in the cervical spine, use M41.02; if the curve extends into the mid-thoracic levels, consider M41.04.

03A child diagnosed with infantile scoliosis at age 2 is now 8. Which code applies?

M41.03 still applies. The ICD-10-CM classification for idiopathic scoliosis is determined by age at first diagnosis, not the patient's current age. Document the original diagnosis date to support the code assignment.

04When should I use Q76.3 instead of M41.03?

Use Q76.3 (congenital scoliosis due to bony malformation) when imaging reveals a structural vertebral anomaly such as a hemivertebra or unsegmented bar as the cause of the curve. M41.03 is reserved for idiopathic cases where no such anomaly is identified.

05Is M41.03 billable as a primary diagnosis, or does it need a supporting code?

M41.03 is a fully billable, specific ICD-10-CM code per the FY2026 tabular list and can stand alone as the principal diagnosis. However, if the visit also addresses neurological symptoms, respiratory compromise, or other sequelae of the curve, code those conditions additionally.

06Can I use M41.03 for postoperative follow-up visits after spinal fusion?

Yes, if the underlying diagnosis remains infantile idiopathic scoliosis of the cervicothoracic region. Add a status code (e.g., Z98.1 for arthrodesis) and any relevant encounter code as appropriate. Use M96.89 only if the scoliosis itself arose as a direct consequence of a prior procedure — not for pre-existing idiopathic curves managed surgically.

07Does M41.03 require a 7th character extension?

No. M41.03 is an M-code (musculoskeletal disease), not an injury S-code. The 7th-character extension system (A/D/S for initial encounter, subsequent encounter, sequela) does not apply to M41.03.

Sources & references

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

Mira AI Scribe

Mira AI Scribe captures the patient's age at first scoliosis diagnosis, the spinal levels defining the curve (end vertebrae), the Cobb angle from the most recent full-spine radiograph, and the absence of any documented congenital vertebral anomaly — the four elements that lock in M41.03 and prevent downcoding to the unspecified site (M41.00) or miscoding to a juvenile/adolescent category.

See how Mira captures M41.03 documentation