ICD-10-CM · Other

M12.58

Traumatic arthropathy at a site not captured by any other specific M12.5x subcategory — per the ICD-10-CM Tabular, this includes vertebral traumatic arthropathy as the primary 'Applicable To' example.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 8
Region: Other

Drawn from CDCICD10DataAAPCCodingoasisforumPracticefusion

Documentation tips

What should appear in the chart to support M12.58.

Source · Editorial brief grounded in 5 cited references ↓

Specify the exact anatomical site in the note — for vertebral involvement, document the spinal level (e.g., L4-L5) to support M12.58 versus a more specific code.
Physician must explicitly document 'traumatic arthropathy' or equivalent language; do not infer this diagnosis from a history of injury alone — documentation drives M12.5- vs M19.1- selection.
Record the inciting trauma (type, date, mechanism) and link it to the current joint condition; this chain of causation is required to justify M12.58 over non-traumatic arthropathy codes.
If sequela coding is appropriate, document the original injury code with 7th character S alongside M12.58 to complete the clinical picture and satisfy audit requirements.
Note any imaging findings (joint space changes, osteophyte formation, ankylosis) that substantiate chronic post-traumatic joint pathology rather than acute injury or degenerative OA.

Related CPT procedures

Procedure codes commonly billed with M12.58. 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.

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.

72110 $53.44

Radiologic examination of the lumbar spine (lumbosacral) with a minimum of four views, including oblique and/or bending views.

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.

27279 $758.53

Minimally invasive arthrodesis of the sacroiliac joint using a transfixing implant device placed percutaneously across the joint.

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.

Common coding pitfalls

The recurring mistakes coders make with M12.58 and adjacent codes.

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

Assigning M12.58 when the physician documented 'post-traumatic arthritis' or 'post-traumatic osteoarthritis' — that language maps to M19.1-, not M12.5-.
Using M12.58 for an acute traumatic joint injury — the M12.5 category excludes current injuries; code those with the appropriate S-code (7th character A for initial encounter, D for subsequent).
Defaulting to M12.58 when a site-specific M12.5x code exists — check shoulder (M12.51-), elbow (M12.52-), wrist (M12.53-), hand (M12.54-), hip (M12.55-), knee (M12.56-), and ankle/foot (M12.57-) before landing on M12.58.
Failing to add a sequela S-code for the original fracture or injury when the clinical record supports it — missing this secondary code leaves the causative chain incomplete for payers and auditors.
Applying M12.58 to post-traumatic OA of the hip, knee, or first CMC joint — those are specifically excluded from M12.5 and must be coded to M16.4-M16.5, M17.2-M17.3, or M18.2-M18.3 respectively.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M12.58 applies when joint disease is the chronic sequela of a prior traumatic injury — not the acute injury itself — at a site that doesn't map to the site-specific M12.5x codes (shoulder, elbow, wrist, hand, hip, knee, ankle/foot). Per the ICD-10-CM Tabular, vertebral traumatic arthropathy is explicitly listed under M12.58's 'Applicable To' note, making it the go-to code when spinal joints are involved and the condition is documented as traumatic arthropathy rather than post-traumatic osteoarthritis.

The critical coding distinction: M12.58 is reserved for joint disease caused by trauma-induced bleeding, swelling, or distension that leads to adhesion formation or fibrous ankylosis. If the physician's note says 'post-traumatic arthritis' or describes accelerated cartilage wear-out from prior injury, M19.1- (post-traumatic osteoarthritis, other joint) is the correct category instead. Do not conflate the two — M12.5- and M19.1- are mutually exclusive paths, and the documentation must drive the choice.

The M12.5 parent category carries a Type 1 Excludes for current injuries (code those with the appropriate S-code from the Alphabetic Index), post-traumatic osteoarthritis of specific joints (M16.4-M16.5 for hip, M17.2-M17.3 for knee, M18.2-M18.3 for first CMC joint), and post-traumatic osteoarthritis NOS (M19.1-). If sequela coding for the original fracture or injury is appropriate, assign an additional S-code with 7th character S alongside M12.58.

Inclusion & exclusion notes

Per the official ICD-10-CM Tabular List.

Source · CDC ICD-10-CM Official Tabular List · 2026

Includes

Traumatic arthropathy, vertebrae

Sibling codes

Other billable codes under M12.5 (laterality / anatomic variants).

M12.59

Traumatic arthropathy, multiple sites

M12.50

Traumatic arthropathy, unspecified site

Frequently asked questions

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

01What is the difference between M12.58 and M19.1- for a joint injured in an accident?

M12.58 applies when documentation states 'traumatic arthropathy' — joint disease from trauma-induced bleeding or adhesion formation. M19.1- applies when documentation states 'post-traumatic arthritis' or describes cartilage wear-out accelerated by prior injury. The physician's exact language drives the choice; coders should not select between them independently.

02Is vertebral traumatic arthropathy correctly coded to M12.58?

Yes. The ICD-10-CM Tabular List includes an 'Applicable To' note under M12.58 specifically for traumatic arthropathy of the vertebrae, making it the correct code when spinal joints are affected and the condition meets the traumatic arthropathy definition.

03Can I use M12.58 for an acute joint injury sustained in the current encounter?

No. The M12.5 category carries a Type 1 Excludes for current injuries. Code the acute injury with the appropriate S-code from the Alphabetic Index. M12.58 is for chronic joint disease that persists as a sequela of prior trauma.

04Should I also assign a sequela S-code when coding M12.58?

When the original injury is documented and the current condition is explicitly the sequela of that injury, assigning the applicable S-code with 7th character S alongside M12.58 provides the complete causative picture and is supported by ICD-10-CM coding conventions. Whether it is required depends on payer policy and clinical documentation.

05Why can't I use M12.58 for post-traumatic OA of the knee or hip?

Post-traumatic osteoarthritis of the hip (M16.4-M16.5), knee (M17.2-M17.3), and first CMC joint (M18.2-M18.3) are Type 1 Excludes from the M12.5 parent category. ICD-10-CM instructs coders to never report a Type 1 Excludes code together with M12.5x; use the OA-specific codes for those joints.

06What if multiple sites are involved, including one 'other specified' site?

If traumatic arthropathy affects multiple joints, consider M12.59 (traumatic arthropathy, multiple sites). Use M12.58 only when a single 'other specified' site — such as a vertebral joint — is the focus of the encounter.

07Does M12.58 require a 7th character?

No. M12.58 is a complete, billable 5-character code with no 7th-character extension requirement. The 7th-character A/D/S convention applies to injury S-codes, not to M-category arthropathy codes.

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 October 1, 2025)
02
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M05-M14/M12-/M12.58
03
aapc.com
https://www.aapc.com/codes/icd-10-codes/M12.58
04
codingoasisforum.decisionhealth.com
https://codingoasisforum.decisionhealth.com/discussion/1162/traumatic-arthropathy-m12-5-vs-post-traumatic-osteoarthritis-m19-1
05
practicefusion.com
https://www.practicefusion.com/icd-10/clinical-concepts-for-orthopedics/icd-10-clinical-scenarios/

Mira AI Scribe

Mira captures the treating physician's explicit designation of 'traumatic arthropathy,' the affected anatomical site (especially vertebral level if spinal), the nature and approximate date of the inciting trauma, and any imaging findings showing chronic joint changes. This prevents a default drop to an unspecified arthropathy code, blocks inappropriate crossover to M19.1- (post-traumatic OA), and preserves the audit trail linking the current diagnosis to its traumatic cause.

See how Mira captures M12.58 documentation