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ICD-10-CM · FY 2026 APRIL UPDATE

M13.1

Monoarthritis, not elsewhere classified

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
M13.10Monoarthritis, not elsewhere classified, unspecified siteBillable
M13.11Monoarthritis, not elsewhere classified, shoulderCategory
M13.111Monoarthritis, not elsewhere classified, right shoulderBillable
M13.112Monoarthritis, not elsewhere classified, left shoulderBillable
M13.119Monoarthritis, not elsewhere classified, unspecified shoulderBillable
M13.12Monoarthritis, not elsewhere classified, elbowCategory
M13.121Monoarthritis, not elsewhere classified, right elbowBillable
M13.122Monoarthritis, not elsewhere classified, left elbowBillable
M13.129Monoarthritis, not elsewhere classified, unspecified elbowBillable
M13.13Monoarthritis, not elsewhere classified, wristCategory
M13.131Monoarthritis, not elsewhere classified, right wristBillable
M13.132Monoarthritis, not elsewhere classified, left wristBillable
M13.139Monoarthritis, not elsewhere classified, unspecified wristBillable
M13.14Monoarthritis, not elsewhere classified, handCategory
M13.141Monoarthritis, not elsewhere classified, right handBillable
M13.142Monoarthritis, not elsewhere classified, left handBillable
M13.149Monoarthritis, not elsewhere classified, unspecified handBillable
M13.15Monoarthritis, not elsewhere classified, hipCategory
M13.151Monoarthritis, not elsewhere classified, right hipBillable
M13.152Monoarthritis, not elsewhere classified, left hipBillable
M13.159Monoarthritis, not elsewhere classified, unspecified hipBillable
M13.16Monoarthritis, not elsewhere classified, kneeCategory
M13.161Monoarthritis, not elsewhere classified, right kneeBillable
M13.162Monoarthritis, not elsewhere classified, left kneeBillable
M13.169Monoarthritis, not elsewhere classified, unspecified kneeBillable
M13.17Monoarthritis, not elsewhere classified, ankle and footCategory
M13.171Monoarthritis, not elsewhere classified, right ankle and footBillable
M13.172Monoarthritis, not elsewhere classified, left ankle and footBillable
M13.179Monoarthritis, not elsewhere classified, unspecified ankle and footBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.