ICD-10-CM · Spine

M06.08

Seronegative rheumatoid arthritis affecting the vertebral column, confirmed without detectable rheumatoid factor on laboratory testing.

Verified May 8, 2026 · 5 sources ↓

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

Drawn from CDCICD10DataCMSAAPCNIH

Documentation tips

What should appear in the chart to support M06.08.

Source · Editorial brief grounded in 5 cited references ↓

Record explicit RF-negative lab result or clinical seronegative designation — the code title requires absence of rheumatoid factor, and an audit will look for supporting lab documentation.
Specify the vertebral region involved (cervical, thoracic, lumbar, sacral) in the note; while M06.08 does not sub-divide by spinal level, this detail supports medical necessity for imaging and surgical authorization.
Document the clinical basis for the RA diagnosis when RF is negative — ACR/EULAR criteria fulfillment, anti-CCP status, synovitis pattern, and duration all strengthen the record against a payer challenge.
If both peripheral joints and vertebrae are affected, consider whether M06.09 (multiple sites) is more accurate than M06.08 alone; report M06.08 only when vertebral involvement is the sole or primary documented site.
For surgical encounters, confirm the operative note ties the procedure indication to vertebral RA specifically, not degenerative disc disease or another overlapping spinal diagnosis.

Related CPT procedures

Procedure codes commonly billed with M06.08. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

22548 $1,943.60

Arthrodesis of the clivus-C1-C2 complex via anterior transoral or extraoral approach, with or without odontoid process excision.

22551 $1,604.91

Anterior cervical discectomy and fusion (ACDF) at a single interspace, performed through a front-of-neck approach with removal of disc material and arthrodesis of adjacent vertebral bodies.

22552 $353.05

Add-on code for each additional cervical interspace fused via anterior interbody approach during the same session as the primary procedure (22551), including disc space preparation, discectomy, osteophytectomy, and spinal cord or nerve root decompression below C2.

22554 $1,215.79

Anterior interbody arthrodesis of the cervical spine below C2, performed via anterior approach with minimal diskectomy to prepare the interspace for fusion — not performed for decompression purposes.

22590 $1,559.15

Posterior arthrodesis of the craniocervical junction, spanning from the occiput through C2, performed to eliminate pathologic motion at the skull-cervical interface.

22595 $1,499.03

Posterior arthrodesis of the atlas and axis (C1-C2), surgically fusing the first and second cervical vertebrae through a posterior approach to stabilize the upper cervical spine.

22600 $1,282.93

Posterior or posterolateral cervical spinal fusion at a single interspace below C2, performed through a posterior approach to achieve bony arthrodesis.

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.

72141 $190.72

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

72156 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M06.08 and adjacent codes.

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

Selecting M06.08 when lab results show positive RF or anti-CCP — seropositive vertebral RA belongs in the M05 category, not M06.
Defaulting to M06.08 for any seronegative spinal arthritis without confirming an RA diagnosis — ankylosing spondylitis, psoriatic spondylitis, and reactive arthritis are coded elsewhere and have their own specific categories.
Using M06.08 alongside M06.09 (multiple sites) for the same encounter when vertebrae are only one of several involved sites — M06.09 already captures multi-site disease and is the more specific choice in that scenario.
Confusing M06.08 (seronegative RA, vertebrae) with M06.88 (other specified rheumatoid arthritis, vertebrae) — M06.88 is a distinct code reserved for other specified RA types, not seronegative RA.
Omitting comorbidity codes that affect DRG weight — failing to code MCC/CC conditions when present will downgrade the MS-DRG from 545 to 547, reducing reimbursement.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M06.08 applies when a provider documents inflammatory arthritis of the spine that meets rheumatoid arthritis criteria clinically but tests negative for rheumatoid factor (RF) — sometimes called seronegative RA. The vertebral site distinguishes this code from all other M06.0x entries, which are lateralized peripheral joints. Because the spine is a single anatomical region (not a paired structure), M06.08 carries no laterality suffix — it is the only billable code at this specificity level for vertebral involvement under M06.0.

The critical coding decision here is seropositive versus seronegative status. If the patient has a positive RF or anti-CCP and vertebral RA, look to the M05 category instead. If the record documents RA with vertebral involvement but does not specify RF status, query the provider before defaulting to M06.08 — using an unspecified code (M06.00 or M06.9) is preferable to an unsupported seronegative assumption.

M06.08 maps to MS-DRG v43.0 groups 545–547 (Connective tissue disorders with/without MCC/CC), so the presence of comorbid complications directly affects reimbursement weight. When cervical spine involvement is the indication for surgical intervention, CMS Billing and Coding Article A59668 lists M06.08-compatible diagnoses supporting medical necessity for CPT codes 22548, 22551, 22552, 22554, 22590, 22595, and 22600.

Sibling codes

Other billable codes under M06.0 (laterality / anatomic variants).

M06.09

Rheumatoid arthritis w/o rheumatoid factor, multiple sites

M06.00

Rheumatoid arthritis without rheumatoid factor, unsp site

M06.0A

Rheumatoid arthritis without rheumatoid factor, oth site

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Does M06.08 require a negative RF lab result in the chart?

Yes. The code title specifies 'without rheumatoid factor.' A documented negative RF result or an explicit provider statement of seronegative status is necessary to support this code on audit. If RF has not been tested, query the provider or use an unspecified code until results are available.

02What is the difference between M06.08 and M06.88?

M06.08 is seronegative rheumatoid arthritis of the vertebrae (RF-negative). M06.88 is other specified rheumatoid arthritis of the vertebrae — a distinct subcategory under M06.8 used for RA variants that don't fit the standard seronegative classification. Do not interchange them.

03Can I use M06.08 for ankylosing spondylitis or psoriatic spondylitis?

No. Ankylosing spondylitis codes to M45.x and psoriatic spondylitis to M07.x. M06.08 is exclusive to seronegative rheumatoid arthritis with vertebral involvement — a confirmed RA diagnosis is required, not just inflammatory spinal arthritis of any type.

04If the patient has vertebral RA plus knee RA, should I use M06.08 or M06.09?

Use M06.09 (multiple sites) when the provider documents RA involving more than one anatomical region in the same encounter. M06.08 is appropriate only when the vertebrae are the sole documented site of involvement.

05Which CPT codes for cervical spine surgery list M06.08 as a supporting diagnosis for medical necessity?

CMS Billing and Coding Article A59668 identifies M06.08 as a supporting ICD-10-CM code for CPT codes 22548, 22551, 22552, 22554, 22590, 22595, and 22600 — anterior and posterior cervical fusion procedures. Ensure the operative documentation ties the surgical indication explicitly to vertebral RA.

06Does M06.08 have laterality options like other M06.0x codes?

No. The vertebrae are a single non-paired structure, so M06.08 has no right, left, or bilateral variants. It is the sole billable code for seronegative RA of the vertebral column at this specificity level.

07What MS-DRG does M06.08 map to?

M06.08 groups to MS-DRG v43.0 codes 545 (Connective tissue disorders with MCC), 546 (with CC), and 547 (without CC/MCC). Accurately coding comorbidities that qualify as MCC or CC directly affects which tier applies and the associated reimbursement.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures RF lab status (negative result with date), the specific spinal region documented as involved, any anti-CCP result, ACR/EULAR criteria elements noted by the provider, and prior DMARD or biologic therapy history. This prevents a payer from flagging the encounter for missing seronegative confirmation or conflating the diagnosis with seropositive RA or degenerative spinal disease.

See how Mira captures M06.08 documentation