M02.00

Reactive joint disease that develops as a consequence of intestinal bypass surgery, coded here when the specific joint site is not documented.

Verified May 8, 2026 · 4 sources ↓

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

Drawn from CDCICD10DataNIH

Documentation tips

What should appear in the chart to support M02.00.

Source · Editorial brief grounded in 4 cited references ↓

Explicitly document the intestinal bypass surgery type (e.g., jejunoileal bypass, Roux-en-Y gastric bypass) and date — the causal link between bypass history and joint symptoms must be clear to support M02.00 over a nonspecific arthropathy code.
Identify and record each affected joint by name and laterality; if a specific site is documented, downselect from M02.00 to the appropriate site-specific M02.0x subcode to avoid an unspecified-site audit flag.
Note onset and progression of joint symptoms in temporal relation to the bypass procedure, including any symmetric or migratory joint involvement, which is characteristic of bypass arthropathy.
Record any pertinent lab findings (ESR, CRP, rheumatoid factor, uric acid) and imaging results that rule out primary inflammatory or crystal arthropathy — this supports the reactive/post-bypass etiology.
If a Z-code for bariatric or intestinal bypass history is applicable (e.g., Z98.84), include it as a secondary code to provide clinical context for payers.

Related CPT procedures

Procedure codes commonly billed with M02.00. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

20610 $68.81

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

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.

73721 $204.41

MRI of a lower extremity joint (hip, knee, or ankle) performed without contrast material.

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.

73223 View procedure details

77072 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M02.00 and adjacent codes.

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

Defaulting to M02.00 when a joint site is actually documented — always use the site-specific M02.0x code; unspecified-site codes draw scrutiny from payers and are a common audit trigger.
Coding M02.00 for post-bariatric joint pain without a provider-documented causal link to the bypass; general musculoskeletal complaints in a bariatric patient do not automatically qualify for this code.
Confusing M02.00 with primary or secondary osteoarthritis (M15–M19) or with other reactive arthropathies (M02.3x Reiter's disease); bypass arthropathy is a distinct entity requiring clear surgical history documentation.
Omitting the intestinal bypass surgical history code — failing to sequence or include the relevant Z-code can make the claim appear unsupported and increase denial risk.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

M02.00 applies when joint inflammation or arthropathy is directly attributed to a prior intestinal bypass procedure and the affected site is not specified in the documentation. This is a reactive arthropathy — the joint pathology is a systemic consequence of altered gut anatomy and associated immunologic or metabolic changes, not a primary infectious or degenerative process. Intestinal bypass arthropathy is classified under reactive arthropathies (M02), not osteoarthritis or inflammatory arthritis categories.

Use M02.00 only when the operative history clearly documents intestinal bypass and the provider links the joint symptoms to that history. If the joint site is documented, always select the site-specific code from the M02.0x subcategory — shoulder (M02.01x), elbow (M02.02x), wrist (M02.03x), hand (M02.04x), hip (M02.05x), knee (M02.06x), ankle/foot (M02.07x), or other specified site (M02.08x). Reserve M02.00 for genuinely undocumented or multi-joint presentations where no single site is identified.

This code appears infrequently in pure orthopedic settings but is relevant when an orthopedic provider is managing joint symptoms in a post-bariatric or post-bowel-resection patient. Sequencing matters: the arthropathy (M02.00) is typically the reason for the orthopedic encounter, but the underlying surgical history may warrant an additional Z-code for the bypass status.

Sibling codes

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

M02.08

Arthropathy following intestinal bypass, vertebrae

M02.09

Arthropathy following intestinal bypass, multiple sites

Frequently asked questions

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

01When should I use M02.00 versus a more specific M02.0x code?

Use M02.00 only when the affected joint site is genuinely not documented. If documentation names any joint — knee, shoulder, hip, etc. — select the corresponding site-specific M02.0x subcode. Unspecified-site codes should be a last resort, not a default.

02Does the type of intestinal bypass procedure affect which code I use?

No — M02.00 (and the M02.0x family) covers arthropathy following intestinal bypass regardless of the specific bypass technique (jejunoileal, Roux-en-Y, etc.). Document the procedure type in the record for clinical context, but it does not change the ICD-10-CM code selection.

03Can M02.00 be used for arthritis that develops years after bypass surgery?

Yes, if the provider documents a clinical link between the bypass history and current joint symptoms. Bypass arthropathy can present months to years post-operatively. The temporal gap alone does not disqualify the code, but the provider must explicitly attribute the arthropathy to the bypass.

04Should I code the intestinal bypass surgical history separately?

Yes. Include an appropriate Z-code for the bypass history (e.g., Z98.84 for bariatric surgery status where applicable) as a secondary code. This provides payers with clinical context and strengthens the causal narrative supporting M02.00.

05Is M02.00 appropriate if the patient also has a separate diagnosis of osteoarthritis in the same joint?

It depends on provider documentation. If the provider distinguishes reactive bypass arthropathy from a coexisting osteoarthritis diagnosis in the same joint, both codes can be reported. There is no Excludes1 note preventing simultaneous use. Document each condition separately with supporting clinical findings.

06What CPT procedures are commonly billed alongside M02.00?

Joint aspiration and injection codes (20610 for large joints, 20600 for small joints) are the most common procedural pairings. Imaging codes such as 73721 (MRI lower extremity) or 73223 (MRI upper extremity) are used for diagnostic workup. E/M codes (99213, 99214) apply for evaluation and management encounters.

Sources & references

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

Mira AI Scribe

Mira AI Scribe captures the documented history of intestinal bypass surgery, the specific joints affected with laterality, symptom onset relative to the surgery, and any labs or imaging that exclude primary inflammatory arthritis. This prevents downcoding to a nonspecific arthropathy code and protects against payer denials for insufficient causal documentation.

See how Mira captures M02.00 documentation