ICD-10-CM · Spine

M54.03

Inflammation of the subcutaneous fat (panniculitis) localized to the cervicothoracic region — the junction of the cervical and thoracic spine, roughly C7–T1 — causing dorsal pain in the lower neck and upper back.

Verified May 8, 2026 · 4 sources ↓

Status: Billable
Chapter: 13
Related CPT: 6
Region: Spine

Drawn from CDCICD10DataAAPCCMS

Documentation tips

What should appear in the chart to support M54.03.

Source · Editorial brief grounded in 4 cited references ↓

Provider must explicitly document 'panniculitis' at the cervicothoracic region — generic 'neck and upper back pain' does not support M54.03.
Record any imaging or biopsy findings that confirm subcutaneous fat inflammation distinct from disc, radicular, or muscular pathology.
Document that lupus panniculitis (L93.2), panniculitis NOS (M79.3), and Weber-Christian relapsing panniculitis (M35.6) have been considered and ruled out, since all three are Excludes1 to M54.0.
Specify the cervicothoracic region by anatomic reference (e.g., C7–T1 junction) to support level-of-care and medical necessity review.
If systemic autoimmune or inflammatory disease is present, document whether it is causally related to the panniculitis — a causal link redirects coding away from M54.03.

Related CPT procedures

Procedure codes commonly billed with M54.03. 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.

72141 $190.72

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

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.

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.

20552 $51.77

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

Common coding pitfalls

The recurring mistakes coders make with M54.03 and adjacent codes.

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

Billing the parent code M54.0 instead of M54.03 — M54.0 is non-billable and will reject; always code to the region-specific subcategory.
Assigning M54.03 when the diagnosis is panniculitis NOS (M79.3) or lupus panniculitis (L93.2) — both are Excludes1 and cannot be used interchangeably with M54.03.
Confusing M54.03 with M54.13 (Radiculopathy, cervicothoracic region) — radiculopathy and panniculitis are distinct diagnoses; use provider documentation to distinguish.
Using M54.03 as a default for unspecified upper back or neck pain — it requires confirmed panniculitis, not merely pain in the region.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

M54.03 is the billable code for panniculitis that affects the cervicothoracic spinal region specifically. It sits under parent code M54.0 (Panniculitis affecting regions of neck and back), which is non-billable on its own. Use M54.03 when the provider documents inflammatory involvement of the subcutaneous fat at the cervicothoracic junction — not simply neck or upper back pain of another etiology.

Three hard Excludes1 rules govern this code: lupus panniculitis (L93.2), panniculitis NOS (M79.3), and relapsing Weber-Christian panniculitis (M35.6). If the panniculitis has a systemic or identified inflammatory cause, you must route to those codes instead — M54.03 cannot be reported alongside them. Additionally, psychogenic dorsalgia (F45.41) is excluded at the M54 category level.

In an orthopedic or spine practice, M54.03 is uncommon relative to radiculopathy or disc disorder codes but appears in workups where soft-tissue inflammation at the cervicothoracic junction is the confirmed diagnosis. It is distinct from M54.13 (Radiculopathy, cervicothoracic region) — if nerve root involvement is documented, M54.13 applies instead. Confirm with the provider whether the diagnosis is panniculitis specifically before assigning M54.03, as the term is frequently confused with general posterior neck and upper back pain.

Sibling codes

Other billable codes under M54.0 (laterality / anatomic variants).

M54.07

Panniculitis affecting regions of neck/bk, lumbosacr region

M54.08

Panniculitis aff regions of neck/bk, sacr/sacrocygl region

M54.06

Panniculitis affecting regions of neck/bk, lumbar region

M54.09

Panniculitis aff regions, neck/bk, multiple sites in spine

M54.01

Panniculitis aff regions of neck/bk, occipt-atlan-ax region

M54.05

Panniculitis affecting regions of neck/bk, thoracolum region

M54.04

Panniculitis affecting regions of neck/bk, thoracic region

M54.02

Panniculitis affecting regions of neck/bk, cervical region

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 4 cited references ↓

01Is M54.0 billable on its own?

No. M54.0 (Panniculitis affecting regions of neck and back) is a non-billable parent code. You must code to the region-specific subcategory — M54.03 for the cervicothoracic region — to submit a billable claim.

02Can I use M54.03 when the patient has lupus panniculitis at the cervicothoracic region?

No. Lupus panniculitis codes to L93.2, which is an Excludes1 condition under M54.0. The two codes cannot be reported together; L93.2 replaces M54.03 when a lupus etiology is documented.

03What is the difference between M54.03 and M54.13?

M54.03 is panniculitis (subcutaneous fat inflammation) at the cervicothoracic region; M54.13 is radiculopathy at the same region. They describe different pathologies — confirm with the provider's diagnosis before assigning either.

04Does M54.03 require a 7th-character extension?

No. M54.03 is an M-code (musculoskeletal, non-injury). 7th-character encounter extensions (A/D/S) apply to injury S-codes, not to M54.- dorsalgia codes.

05Can I report M54.03 alongside M79.3 (Panniculitis NOS)?

No. M79.3 is listed as an Excludes1 condition under M54.0, making it mutually exclusive with M54.03. If the panniculitis lacks a specified regional or systemic characterization, M79.3 is the appropriate code, not M54.03.

06What CPT procedures are typically reported with M54.03?

Evaluation and management codes (99213, 99214) and cervical spine imaging (72141 MRI cervical spine) are most common. Physical therapy procedures such as 97140 may apply if conservative management is initiated.

Sources & references

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

01CDC ICD-10-CM Tabular List 2026 (effective October 1, 2025)
02
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M50-M54/M54-/M54.03
03
aapc.com
https://www.aapc.com/codes/icd-10-codes/M54.03
04
cms.gov
https://www.cms.gov/medicare/coding/icd10/downloads/icd10clinicalconceptsorthopedics1.pdf

Mira AI Scribe

The Mira AI Scribe captures the provider's explicit diagnosis of cervicothoracic panniculitis, anatomic localization to the C7–T1 junction, any imaging or biopsy findings supporting subcutaneous fat inflammation, and documentation ruling out lupus or Weber-Christian panniculitis. This prevents downcoding to the non-billable M54.0 parent or misdirection to M79.3, which would generate a claim rejection or audit flag for Excludes1 noncompliance.

See how Mira captures M54.03 documentation