M12.19

Kaschin-Beck disease affecting multiple joint sites simultaneously — a chronic, disabling osteochondrodysplasia characterized by osteosclerosis, cone-shaped metaphyses, and diaphyseal shortening involving more than one anatomical region.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 10
Region: Multi-region

Drawn from CDCICD10DataAAPCCdekFindacode

Documentation tips

What should appear in the chart to support M12.19.

Source · Editorial brief grounded in 5 cited references ↓

Name every affected joint region (e.g., bilateral fingers, right elbow, bilateral knees) to justify 'multiple sites' over a single-site or unspecified code.
Record imaging findings that support osteochondrodysplasia — osteosclerosis, cone-shaped metaphyses, joint space narrowing, or epiphyseal abnormalities on plain films or MRI.
Document the patient's geographic or dietary history relevant to endemic exposure (Siberia, northern China, selenium-deficient regions) to support the clinical diagnosis.
Note functional limitations and range-of-motion deficits at each involved joint to substantiate medical necessity for imaging, therapy, or surgical intervention.
If the condition is stable or monitored, distinguish active disease from sequela in the note — sequela coding may apply in long-standing cases where the acute phase has resolved.

Related CPT procedures

Procedure codes commonly billed with M12.19. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

73000 $33.40

Radiologic examination of the clavicle (collarbone), complete — minimum two views required to satisfy 'complete' standard.

73100 $34.40

Radiologic examination of the wrist with a minimum of two views.

73560 $34.40

Radiologic examination of the knee joint, one or two views, unilateral.

73600 $32.40

Radiologic examination of the ankle joint, two views — typically AP and lateral — used to evaluate for fracture, dislocation, or other bony pathology.

73630 $34.07

Radiologic examination of the foot requiring a minimum of three views, used to evaluate fractures, arthritis, tumors, or structural abnormalities.

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.

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

97530 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M12.19 and adjacent codes.

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

Using M12.10 (unspecified site) when the record clearly lists multiple affected joints — 'unspecified' requires absent documentation, not polyarticular involvement.
Assigning an arthrosis code (M15–M19) alongside M12.19 in violation of the Excludes1 note at the M12 category level; if secondary degenerative change is documented, clarify with the provider whether it represents a distinct diagnosis.
Defaulting to M12.19 for a single dominant site — review the record to see if one joint is the primary focus; if so, use the site-specific M12.1x code instead.
Confusing Kaschin-Beck disease with other endemic or nutritional arthropathies and selecting an incorrect parent category; M12.1 is the exclusive home for this condition in ICD-10-CM.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M12.19 is the correct code when a provider documents Kaschin-Beck disease with involvement at multiple joint sites and no single dominant site is identified as the primary location. Kaschin-Beck is an endemic osteochondrodysplasia historically linked to selenium deficiency and mycotoxin exposure in grain, most prevalent in Siberia, northern China, and parts of Korea. In an orthopedic practice, you are most likely to encounter it in immigrants or patients with a history in endemic regions presenting with polyarticular joint pain, deformity, and restricted range of motion affecting joints such as the fingers, elbows, knees, and ankles concurrently.

Within the M12.1 subcategory, site-specific codes (e.g., M12.11 for shoulder, M12.16 for knee) should be used when a single dominant site is documented. Use M12.19 only when documentation explicitly identifies multiple affected sites without a single site carrying the primary diagnostic weight, or when the clinical picture is genuinely polyarticular. M12.10 (unspecified site) is reserved for cases where site documentation is absent — it is not a substitute for M12.19 when multiple sites are clearly noted.

M12 carries an Excludes1 note barring simultaneous assignment of arthrosis codes (M15–M19). If the patient also has degenerative joint disease documented as a separate condition, query whether the arthrosis is a manifestation of the Kaschin-Beck process or a truly distinct entity before adding an M15–M19 code. Cricoarytenoid arthropathy (J38.7) is also excluded from M12.

Sibling codes

Other billable codes under M12.1 (laterality / anatomic variants).

M12.10

Kaschin-Beck disease, unspecified site

M12.18

Kaschin-Beck disease, vertebrae

Frequently asked questions

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

01When should I use M12.19 versus M12.10?

Use M12.19 when the provider documents multiple specific joint sites affected by Kaschin-Beck disease. Use M12.10 only when no site is identified at all in the documentation.

02Can I code a degenerative joint disease (M15–M19) alongside M12.19?

No. The Excludes1 note at the M12 category level prohibits simultaneous assignment of arthrosis codes M15–M19. Query the provider if you believe the degenerative change is a truly separate condition unrelated to the Kaschin-Beck process.

03Is Kaschin-Beck disease common enough in U.S. orthopedic practice to warrant a dedicated workflow?

It is rare in the U.S. but does appear in immigrant populations from Siberia, northern China, and other endemic regions. Having the M12.1x codes mapped in your EHR helps avoid miscoding as unspecified arthropathy.

04Does M12.19 require a 7th character extension?

No. M12.19 is a complete, billable code with no 7th-character requirement. The 7th-character extension conventions (A, D, S) apply to injury S-codes, not M-category arthropathy codes.

05How do I code Kaschin-Beck disease when only one joint is affected?

Drop to the site-specific code within M12.1: for example, M12.11 (shoulder), M12.12 (elbow), M12.16 (knee), or M12.17 (ankle and foot). Reserve M12.19 for genuinely polyarticular presentations.

06What ICD-9-CM code did M12.19 replace?

M12.19 crosswalks from ICD-9-CM 716.19 (traumatic arthropathy, multiple sites) via the general Kaschin-Beck mapping. Confirm the crosswalk in your encoder, as ICD-9 lacked an exact equivalent.

07Is M12.19 valid for both inpatient and outpatient claims?

Yes. M12.19 is a fully billable code valid for both inpatient facility and outpatient/professional claims as of FY2026 ICD-10-CM (effective October 1, 2025).

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures the provider's enumeration of all involved joint regions, relevant geographic or dietary history supporting endemic exposure, and imaging findings (osteosclerosis, metaphyseal changes, joint space narrowing) at each site. This prevents a downcode to unspecified site (M12.10) or an incorrect single-site code, and eliminates Excludes1 audit flags from inadvertent arthrosis co-coding.

See how Mira captures M12.19 documentation