ICD-10-CM · Spine

M02.08

Reactive arthropathy of the vertebral joints occurring as a direct consequence of prior intestinal bypass surgery, classified under post-procedural arthropathies.

Verified May 8, 2026 · 3 sources ↓

Status: Billable
Chapter: 13
Related CPT: 7
Region: Spine

Drawn from CDCCMS

Documentation tips

What should appear in the chart to support M02.08.

Source · Editorial brief grounded in 3 cited references ↓

Document the specific intestinal bypass procedure by name and date — jejunoileal bypass, Roux-en-Y gastric bypass, etc. — to establish the causal link required for M02.08.
Record the vertebral region(s) affected (cervical, thoracic, lumbar, sacral) and any imaging findings such as facet joint effusion, synovitis, or erosive changes on MRI or CT.
Note prior or concurrent peripheral joint involvement so additional M02.0x site-specific codes can be assigned for each affected joint.
Document whether conservative care has been attempted (NSAIDs, physical therapy, corticosteroid injections) to support medical necessity for advanced imaging or specialist referral.
If laboratory findings support immune-complex arthropathy (elevated CRP, ESR, positive ANA at low titer), include them in the note to distinguish from coincidental degenerative spine disease.

Related CPT procedures

Procedure codes commonly billed with M02.08. 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.

72052 $62.79

Radiologic examination of the cervical spine using six or more distinct views, the highest-level plain-film cervical series in the CPT spine imaging family.

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.

77080 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M02.08 and adjacent codes.

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

Assigning a nonspecific spondylosis or back pain code (M47.x, M54.x) when the provider has documented a clear bypass-arthropathy relationship — M02.08 is the correct specific code and should not be bypassed for a symptom code.
Failing to add a Z98.84 (Bariatric surgery status) or equivalent history code, which leaves the payer without context for why an arthropathy code is appearing on a spine encounter.
Confusing M02.08 with post-infectious reactive arthropathy codes (M02.1x–M02.3x) — M02.08 is procedure-driven, not triggered by a preceding infection.
Using M02.08 for vertebral arthropathy in a patient who has undergone bariatric surgery without intestinal bypass (e.g., sleeve gastrectomy) — the bypass-specific pathway must be present.
Neglecting to code peripheral joint sites separately when both axial and appendicular joints are involved post-bypass; M02.08 covers only the vertebral component.

Clinical context

Source · Editorial summary grounded in 3 cited references ↓

M02.08 applies when a patient develops vertebral joint arthropathy that is causally linked to a prior intestinal bypass procedure — jejunoileal bypass, gastric bypass with intestinal rerouting, or similar bariatric/malabsorptive surgeries. The mechanism is immune-mediated: bacterial overgrowth and altered gut flora following bypass trigger circulating immune complexes that deposit in synovium, including spinal facet joints and intervertebral articulations. The provider must explicitly document the causal relationship between the bypass history and the current spinal arthropathy; without that linkage, a nonspecific spinal arthropathy code is appropriate instead.

This code sits under parent M02.0 (Arthropathy following intestinal bypass), which itself belongs to the reactive arthropathies block (M02). Do not confuse M02.08 with post-infectious reactive arthropathy (M02.1x–M02.3x) or with degenerative spinal disease such as spondylosis (M47.x) — the etiology is procedural, not infectious or degenerative. When the arthropathy affects multiple sites including the vertebrae, code each site separately using the appropriate M02.0x subcodes.

Sequencing follows standard complication-of-care principles: M02.08 can be the principal diagnosis if vertebral arthropathy is the reason for the encounter. Add a Z code for the bypass history (e.g., Z98.84 Bariatric surgery status) when relevant for clinical context. If axial involvement coexists with peripheral joint involvement post-bypass, assign additional M02.0x codes for each affected site rather than defaulting to an unspecified code.

Sibling codes

Other billable codes under M02.0 (laterality / anatomic variants).

M02.09

Arthropathy following intestinal bypass, multiple sites

M02.00

Arthropathy following intestinal bypass, unspecified site

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 3 cited references ↓

01Does M02.08 require a specific type of intestinal bypass surgery, or does any bariatric procedure qualify?

M02.08 is specific to intestinal bypass procedures — surgeries that reroute or exclude a segment of the intestine, such as jejunoileal bypass or Roux-en-Y gastric bypass. Restrictive-only procedures like sleeve gastrectomy do not involve intestinal bypass and do not support this code.

02Can M02.08 be used without imaging confirmation of vertebral joint pathology?

Yes, if the treating provider clinically documents vertebral arthropathy causally linked to prior intestinal bypass. Imaging strengthens the record and supports medical necessity but is not a coding prerequisite under ICD-10-CM conventions.

03How do I code when both the lumbar vertebrae and the knees are affected post-bypass?

Assign M02.08 for the vertebral involvement and the appropriate M02.06x code(s) for knee involvement. Each anatomic site in the M02.0 family has its own subcode — code all documented sites separately.

04Should M02.08 or a spondyloarthropathy code (M45.x) be used if the patient also has ankylosing spondylitis?

Code both if both are documented and clinically distinct. M45.x covers ankylosing spondylitis as a separate condition; M02.08 captures the bypass-related reactive arthropathy. An Excludes1 note would prohibit simultaneous use — check the FY2026 Tabular for any such instruction at M02.0 before assigning both.

05Is there a laterality requirement for M02.08?

No. Vertebral codes in the M02.0x family do not carry laterality sub-characters because spinal involvement is midline/axial by nature. The '8' in the sixth position denotes the vertebrae site within the M02.0 parent — no further laterality digit is required.

06What CPT procedures are commonly billed alongside M02.08 in an orthopedic or spine setting?

Common pairings include spinal MRI (72148 for lumbar, 72141 for cervical), office evaluation and management codes (99213–99214), facet joint injections (20610 used off-label for zygapophyseal joints), bone density studies (77080) given malabsorptive risk, and therapeutic exercises (97110) for rehabilitation.

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)
02CMS ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C and Section I.B.16
03
ftp.cdc.gov
https://ftp.cdc.gov/pub/health_statistics/nchs/publications/ICD10CM/2022/icd10cm-tabular-2022-April-1.pdf

Mira AI Scribe

Mira AI Scribe captures the surgical history (bypass type, date), the patient's reported spinal symptom onset relative to surgery, and any imaging findings showing facet or intervertebral joint inflammation — details that lock in M02.08 over a generic back-pain code and prevent a specificity downcode or medical-necessity audit flag.

See how Mira captures M02.08 documentation