2027 ICD-10-CM Diagnosis Code M11.871Other specified crystal arthropathies, right ankle and foot
ICD-10-CM Codes›M00–M99›M05-M14›M11
- Billable — Valid for Submission
- Chronic Condition
M11.871 is a billable ICD-10-CM diagnosis code for other specified crystal arthropathies, right ankle and foot. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 553 through 554. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Crystal arthropathies (excluding gout).
Code Identity
Code Classification
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M11.871: its own notes plus those printed at block M00-M25 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- Disorders affecting predominantly peripheral (limb) joints
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Arthritis
If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Any disorder that affects the joints is often called arthritis. Joints are places where two bones meet, such as your elbow or knee.
The full article covers:
- What is arthritis?
- What are the types of arthritis?
- What are the symptoms of arthritis?
- Who is more likely to get arthritis?
- How is arthritis diagnosed?
- What are the treatments for arthritis?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M11.871 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M11.871Overview
What is the ICD-10 code for other specified crystal arthropathies, right ankle and foot?
The ICD-10-CM code for other specified crystal arthropathies, right ankle and foot is M11.871 (sometimes written as M11871). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M11.871 (Other specified crystal arthropathies, ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified crystal arthropathies, right ankle and foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M11.871 group to?
When other specified crystal arthropathies, right ankle and foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of M11.871?
Under the General Equivalence Mappings, other specified crystal arthropathies, right ankle and foot converts to ICD-9-CM 712.87 (cryst arthrop NEC-ankle). The mapping is approximate, so confirm the match fits the documentation.
