ICD-10-CM · Spine

M02.88

Reactive arthritis affecting the vertebral joints, triggered by an infection elsewhere in the body — not a direct joint infection itself — and not classifiable under a more specific reactive arthropathy subtype within M02.

Verified May 8, 2026 · 5 sources ↓

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

Drawn from CDCICD10DataAAPCIcd10codedGesund

Documentation tips

What should appear in the chart to support M02.88.

Source · Editorial brief grounded in 5 cited references ↓

Document the precipitating infection explicitly — organism (e.g., Chlamydia trachomatis, Salmonella), site, and timing relative to joint symptoms onset.
Specify that the spinal joint is sterile (no direct infectious etiology), distinguishing reactive arthropathy from septic arthritis or discitis.
Record spinal region(s) affected (cervical, thoracic, lumbar, sacral) and any imaging findings — MRI or X-ray evidence of facet joint inflammation, synovitis, or sacroiliitis.
Note any prior or concurrent peripheral joint involvement, as additional M02.8x site-specific codes may also apply.
If the reactive process is part of Reiter's triad (urethritis, conjunctivitis, arthritis), use M02.3- (Reiter's disease) instead of M02.88.

Related CPT procedures

Procedure codes commonly billed with M02.88. 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.

20610 $68.81

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

72100 $40.42

Radiologic examination of the lumbosacral spine capturing two or three views, used to evaluate the lumbar vertebrae and sacrum for injury, degeneration, or structural abnormality.

Common coding pitfalls

The recurring mistakes coders make with M02.88 and adjacent codes.

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

Using M02.88 when Reiter's disease (M02.3-) is documented — Reiter's has its own subcategory and should not be coded to 'Other reactive arthropathies.'
Assigning M02.88 as principal diagnosis without a supporting infectious etiology code — some payers flag manifestation codes when no underlying condition is coded.
Confusing reactive arthropathy of the vertebrae with ankylosing spondylitis (M45.-) or infectious discitis (M46.3-, M46.4-), which have distinct etiology and different code families.
Failing to code peripheral joint sites separately when the reactive process affects both the spine and extremity joints — M02.88 alone covers only the vertebral involvement.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M02.88 captures reactive arthropathies of the spine (vertebrae) that are postinfective or immune-mediated in origin but do not fit the named subtypes in M02 (e.g., Reiter's disease M02.3-, postdysenteric arthropathy M02.1-, or postimmunization arthropathy M02.2-). The triggering infection — typically enteric (Salmonella, Shigella, Campylobacter, Yersinia) or genitourinary (Chlamydia) — precedes the spinal joint inflammation by days to weeks. The joint itself is sterile on culture.

This code sits under M02.8 (Other reactive arthropathies) and is the vertebral-site variant. When the same reactive process affects peripheral joints in addition to the spine, assign additional M02.8x codes for those sites — M02.88 covers only the vertebral involvement. Do not use M02.88 for ankylosing spondylitis (M45.-), septic arthritis of the spine (M46.2-), or discitis (M46.3-, M46.4-).

M02.88 is billable and valid under FY2026 ICD-10-CM (effective Oct 1, 2025). It is classified as a manifestation code in some payer systems, meaning it may not be accepted as the principal diagnosis alone — pair it with the underlying or precipitating infectious condition using an additional code when documentation supports it.

Sibling codes

Other billable codes under M02.8 (laterality / anatomic variants).

M02.89

Other reactive arthropathies, multiple sites

M02.80

Other reactive arthropathies, unspecified site

Frequently asked questions

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

01What is the difference between M02.88 and M02.9 (reactive arthropathy, unspecified)?

M02.88 specifies the site as vertebrae and the type as 'other' reactive arthropathy — use it when the spinal location is documented but the condition doesn't fit a named M02 subtype. M02.9 is unspecified for both type and site and should only be used when documentation is genuinely insufficient to select a more specific code.

02Can M02.88 be used as a principal diagnosis on a claim?

Some payer edits flag M02.88 as a manifestation code that should not stand alone as the principal diagnosis. Best practice is to code the underlying or preceding infectious condition alongside M02.88 whenever documentation supports it.

03How do I distinguish reactive arthropathy of the spine from ankylosing spondylitis for coding purposes?

Reactive arthropathy (M02.88) follows a documented infection and is typically episodic; ankylosing spondylitis (M45.-) is a chronic, seronegative inflammatory condition without a triggering infection. The clinician's diagnosis drives the code selection — do not infer one from the other.

04Should I code the triggering infection separately when using M02.88?

Yes. When the precipitating infection is documented and still active or relevant, assign an additional code for it. This satisfies etiology-manifestation sequencing conventions and reduces audit risk.

05Does M02.88 require a 7th-character extension?

No. M02.88 is a 5-character M-code and does not use 7th-character extensions. Seventh-character extensions (A, D, S) apply to injury codes in the S-code range, not to musculoskeletal M-codes.

06If a patient has reactive arthritis in both the lumbar spine and the knees, how should I code it?

Assign M02.88 for the vertebral involvement and the appropriate M02.86- code(s) for the knee(s) — right (M02.861), left (M02.862), or unspecified (M02.869). Each affected site gets its own code within the M02.8 subcategory.

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
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M00-M02/M02-/M02.88
03
aapc.com
https://www.aapc.com/codes/icd-10-codes/M02
04
icd10coded.com
https://icd10coded.com/cm/M02.88/
05
gesund.bund.de
https://gesund.bund.de/en/icd-code-suche/m02-88

Mira AI Scribe

Mira AI Scribe captures the documented precipitating infection (organism, site, date of onset), the sterile nature of the spinal joint involvement, affected vertebral region(s), and any imaging findings supporting inflammatory arthropathy. This prevents downcoding to an unspecified arthropathy code and satisfies payer requirements for pairing a manifestation code with its underlying infectious trigger.

See how Mira captures M02.88 documentation