ICD-10-CM · Spine

M54.09

Panniculitis affecting multiple sites in the spine across the neck and back regions — inflammation of subcutaneous fat tissue spanning more than one spinal zone simultaneously.

Verified May 8, 2026 · 3 sources ↓

Status: Billable
Chapter: 13
Related CPT: 5
Region: Spine

Drawn from CDCCMS

Documentation tips

What should appear in the chart to support M54.09.

Source · Editorial brief grounded in 3 cited references ↓

Name each spinal region involved (e.g., cervical and lumbar) — 'multiple sites' must be clinically supported, not inferred.
Document the basis for the panniculitis diagnosis: subcutaneous tenderness, palpable nodules, imaging findings, or biopsy results as applicable.
Record whether this is a new presentation or recurrent/chronic condition, as this affects any co-coded chronic pain qualifier (G89.29).
If systemic features are present (fever, weight loss, associated connective tissue disorder), document those separately — they may require additional codes and affect medical necessity.
Specify that the pathology is in subcutaneous/fat tissue of the back, not the disc, facet joint, or nerve root, to prevent miscoding to disc or radiculopathy codes.

Related CPT procedures

Procedure codes commonly billed with M54.09. 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.

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.

20600 $56.11

Needle aspiration and/or injection of a small joint or bursa — such as a finger or toe joint — performed without ultrasound guidance.

Common coding pitfalls

The recurring mistakes coders make with M54.09 and adjacent codes.

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

Defaulting to M54.9 (dorsalgia, unspecified) when the provider has documented panniculitis — M54.09 is more specific and should be used when the diagnosis is established.
Using M54.09 for a single-region presentation: if only the cervical region is involved, use the appropriate single-site M54.0x code, not M54.09.
Confusing this musculoskeletal panniculitis code with systemic panniculitis diagnoses (e.g., Weber-Christian disease, M35.6) — the clinical and coding distinction depends on whether the condition is localized to spinal regions versus systemic.
Failing to add a chronic pain code (G89.29) when the provider explicitly characterizes the condition as chronic — the Excludes2 note on G89 permits dual coding in that scenario.

Clinical context

Source · Editorial summary grounded in 3 cited references ↓

M54.09 captures panniculitis that involves multiple spinal sites concurrently — for example, both cervical and lumbar regions, or thoracic and sacral regions documented in the same encounter. It sits under parent code M54.0 (Panniculitis affecting regions of neck and back) and is the appropriate selection when documentation confirms inflammation of subcutaneous fatty tissue is not confined to a single spinal level or region.

Use M54.09 only when the provider explicitly documents involvement at multiple spinal sites. If the inflammation is limited to one region, select the site-specific sibling codes under M54.0 instead (e.g., M54.01 for occipito-atlanto-axial region, M54.02 for cervical region). Panniculitis here is a musculoskeletal/connective tissue diagnosis — do not conflate it with Weber-Christian disease or other systemic panniculitides, which map elsewhere in ICD-10-CM.

In orthopedic practice, M54.09 most commonly appears when a patient presents with diffuse posterior trunk tenderness, subcutaneous nodules, or fibrotic changes across spinal regions confirmed by clinical examination or imaging. Distinguish it from nonspecific dorsalgia (M54.9) and from radiculopathy or disc pathology — panniculitis is a diagnosis of the subcutaneous tissue, not the disc, joint, or nerve root.

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

M54.03

Panniculitis aff regions of neck/bk, cervicothor region

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 3 cited references ↓

01What distinguishes M54.09 from M54.9 (dorsalgia, unspecified)?

M54.09 is specific to panniculitis — inflammation of subcutaneous fat — affecting multiple spinal sites. M54.9 is a nonspecific catch-all for back pain without an identified etiology. If the provider has documented panniculitis, M54.09 is required; M54.9 is not acceptable.

02How many spinal sites need to be documented to use M54.09?

At least two distinct spinal regions must be documented (e.g., cervical and thoracic, or thoracic and lumbar). Single-region panniculitis maps to a more specific M54.0x sibling code, not M54.09.

03Can M54.09 be used with a chronic pain code from G89?

Yes. The Excludes2 relationship between G89 and M54 codes means both can be reported when the provider documents chronic panniculitis. Add G89.29 (Other chronic pain) as a secondary code only when chronicity is explicitly stated in the record.

04Is M54.09 appropriate for Weber-Christian disease or lupus-related panniculitis?

No. M54.09 is limited to panniculitis localized to the neck and back regions as a musculoskeletal condition. Systemic panniculitides such as Weber-Christian disease (M35.6) or lupus panniculitis (L93.2) have separate codes and should not be mapped here.

05Does M54.09 require a 7th-character extension?

No. M54.09 is an M-code in Chapter 13 and does not use 7th-character extensions. Those apply to injury S-codes (A/D/S for initial/subsequent/sequela encounters), not musculoskeletal condition codes.

06What CPT procedures are typically billed alongside M54.09?

Office E/M visits (99213–99214) and spinal MRI (72148, 72158) are the most common pairings during workup. If a diagnostic or therapeutic injection is performed, verify medical necessity criteria for that procedure separately, as panniculitis is not a listed indication on most ESI LCD policies.

Sources & references

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

01CDC ICD-10-CM Tabular List 2026 (FY2026, effective Oct 1, 2025)
02
cms.gov
https://www.cms.gov/medicare/coding/icd10/downloads/icd10clinicalconceptsorthopedics1.pdf
03
cms.gov
https://www.cms.gov/Medicare/Coding/ICD10/Downloads/2019-ICD10-Coding-Guidelines-.pdf

Mira AI Scribe

Mira captures documented involvement of multiple spinal regions (e.g., cervical plus lumbar), subcutaneous or soft-tissue inflammation findings on exam, any imaging or biopsy reference supporting panniculitis, and whether the condition is acute or chronic. This prevents downcoding to unspecified dorsalgia (M54.9) and flags when a single-site M54.0x code is more accurate than M54.09.

See how Mira captures M54.09 documentation