ICD-10-CM · Spine

M00.08

Staphylococcal joint infection localized to one or more vertebral articulations, classified under pyogenic (bacterial) arthropathy.

Verified May 8, 2026 · 4 sources ↓

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

Drawn from CDCICD10DataAAPCCMS

Documentation tips

What should appear in the chart to support M00.08.

Source · Editorial brief grounded in 4 cited references ↓

Identify the organism explicitly — 'staphylococcal' must appear in the note, not just 'septic' or 'bacterial' arthritis, to support M00.08 over M00.80 or M00.89.
Document the specific Staphylococcus species or susceptibility pattern (MSSA vs. MRSA) so the required B95.61–B95.8 companion code can be assigned accurately.
Name the vertebral level(s) involved (e.g., L4–L5, C5–C6); although M00.08 has no level sub-codes, this detail supports medical necessity and distinguishes arthritis from adjacent osteomyelitis or discitis.
Record the source of microorganism identification — blood culture, joint aspiration culture, tissue biopsy — to satisfy payer audit criteria for an infectious arthropathy code.
Document all active comorbidities (e.g., bacteremia, diabetes, immunosuppression) at each encounter; these determine whether the claim lands in DRG 548 (MCC) or 549 (CC) vs. 550.

Related CPT procedures

Procedure codes commonly billed with M00.08. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

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.

22612 $1,467.64

Posterior or posterolateral lumbar arthrodesis of a single interspace, performed via a posterior approach with bone graft and typically pedicle screw fixation to achieve vertebral segment fusion.

22630 $1,510.72

Posterior interbody arthrodesis of a single lumbar interspace, including laminectomy and/or discectomy performed to prepare the interspace for fusion rather than for decompression.

22015 $921.86

Open incision and drainage of a deep subfascial abscess along the posterior lumbar, sacral, or lumbosacral spine.

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.

72020 $23.71

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

20610 $68.81

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

22840 $668.35

Posterior non-segmental instrumentation placed during spinal surgery, using rods, hooks, or wires that span multiple vertebral levels without anchoring at each intervening segment.

63030 $898.15

Single-interspace lumbar laminotomy with nerve root decompression, including partial facetectomy, foraminotomy, and/or herniated disc excision performed via open surgical technique.

72156 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M00.08 and adjacent codes.

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

Skipping the mandatory B95.61–B95.8 companion code: the M00.0 tabular note instructs coders to use an additional code to identify the bacterial agent — omitting it is a compliance gap and may trigger a payer edit.
Using M00.08 for prosthetic joint infection of the spine: the Excludes2 note at M00 redirects prosthesis-related infections to T84.5–, even when the organism is Staphylococcus.
Defaulting to M00.09 (staphylococcal polyarthritis) when both vertebral and peripheral joints are involved — report M00.08 plus the appropriate peripheral site code instead of collapsing to polyarthritis.
Confusing vertebral staphylococcal arthritis with vertebral osteomyelitis (M46.2x/M46.3x) or discitis (M46.4x): each has a distinct code family; the physician's documentation must specify which structure is primarily infected.
Assigning M00.08 based on clinical suspicion alone without documented culture or organism identification; if the organism is not yet confirmed, consider M00.80 or M00.9 until culture results are available.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

M00.08 is the correct code when documentation confirms staphylococcal infection of the vertebral joints — distinct from vertebral osteomyelitis or disc space infection. The organism must be identified as Staphylococcus (any species); if the specific strain is documented, pair M00.08 with an additional code from B95.61–B95.8 to identify the bacterial agent (e.g., B95.61 for MSSA, B95.62 for MRSA). This additional code is not optional — the tabular instruction at the M00.0 parent level requires it.

Unlike most M00.0x codes, M00.08 carries no laterality sub-codes because vertebral joints are axial rather than paired appendicular structures. The code stands alone regardless of whether one or multiple vertebral levels are affected. For polyarticular staphylococcal disease involving both vertebral and appendicular joints, report M00.08 plus the appropriate limb-site code rather than defaulting to M00.09 (staphylococcal polyarthritis).

M00.08 maps to MS-DRG 548/549/550 (Septic Arthritis with MCC/CC/without CC/MCC) under MDC 08. The DRG assigned will depend on documented comorbidities and complications, so accurate CC/MCC capture — sepsis, bacteremia, immunosuppression — directly affects reimbursement tier. Also note the Excludes2 at M00: infection and inflammatory reaction due to an internal joint prosthesis routes to T84.5–, not M00.08, even if the organism is staphylococcal.

Sibling codes

Other billable codes under M00.0 (laterality / anatomic variants).

M00.00

Staphylococcal arthritis, unspecified joint

M00.09

Staphylococcal polyarthritis

Frequently asked questions

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

01Do I need a second code with M00.08?

Yes. The M00.0 tabular instruction requires an additional code from B95.61–B95.8 to identify the specific staphylococcal agent. Use B95.61 for MSSA, B95.62 for MRSA, or B95.8 if the species is not further specified.

02Can I use M00.08 when the patient has a spinal implant or fusion hardware?

No. The Excludes2 note at the M00 category redirects infection and inflammatory reaction due to an internal joint prosthesis to T84.5–. Even if Staphylococcus is the organism, hardware-related infection requires T84.5x codes, not M00.08.

03Is there a more specific code if only the lumbar vertebrae are affected?

No. M00.08 has no sub-codes by spinal region. It covers all vertebral levels. Document the specific levels in the clinical note for medical necessity, but the ICD-10-CM code is the same regardless of cervical, thoracic, or lumbar involvement.

04What DRG does M00.08 map to?

M00.08 as principal diagnosis maps to MS-DRG 548 (Septic Arthritis with MCC), 549 (with CC), or 550 (without CC/MCC) under MDC 08, depending on documented comorbidities and complications per MS-DRG v43.0.

05How do I code staphylococcal arthritis affecting both the vertebrae and the knee?

Report both M00.08 and the appropriate knee-site code (e.g., M00.061 for right knee) rather than defaulting to M00.09 (staphylococcal polyarthritis). List the site that drove the encounter as the principal diagnosis.

06What if the culture is pending — can I still use M00.08?

Only if the physician has documented staphylococcal arthritis as the confirmed diagnosis. If the organism is still unconfirmed at the time of coding, use M00.80 (arthritis due to other bacteria, unspecified joint) or M00.9 until results support a specific organism code.

07Is M00.08 appropriate for vertebral osteomyelitis caused by Staphylococcus?

No. Vertebral osteomyelitis maps to M46.2x or the appropriate M46.3x/M46.4x range. M00.08 is specific to joint (articular) infection of the vertebrae. The provider's documentation must distinguish the infected structure — joint versus bone versus disc space.

Sources & references

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

01CDC ICD-10-CM Tabular List 2026 (effective Oct 1, 2025)
02
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M00-M02/M00-/M00.08
03
aapc.com
https://www.aapc.com/codes/icd-10-codes/M00.08
04
cms.gov
https://www.cms.gov/icd10m/version372-fullcode-cms/fullcode_cms/P0214.html

Mira AI Scribe

Mira's AI scribe captures the documented organism (Staphylococcus species and susceptibility), the vertebral level(s) involved, the diagnostic source (culture type and result), and active comorbidities at each encounter. That detail auto-populates the required B95.6x companion code, prevents a drop to unspecified M00.80, and flags DRG-driving CC/MCC conditions — reducing the risk of a downcoded DRG 550 when the claim should land in 548 or 549.

See how Mira captures M00.08 documentation