2027 ICD-10-CM Diagnosis Code M25.475Effusion, left foot
ICD-10-CM Codes›M00–M99›M20-M25›M25
- Billable — Valid for Submission
- Not Chronic
M25.475 is a billable ICD-10-CM diagnosis code for effusion, left foot. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 564 through 566. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Effusion of joint of bilateral feet
- Effusion of joint of left foot
- Effusion of joint of right foot
- Foot joint effusion
- Swelling of bilateral feet
- Swelling of bilateral lower limbs
- Swelling of first metatarsal joint of hallux of bilateral feet
- Swelling of first metatarsal joint of hallux of left foot
- Swelling of first metatarsal joint of hallux of right foot
- Swelling of first metatarsophalangeal joint of hallux
- Swelling of left foot
- Swelling of right foot
- Swelling of toe joint
- Swelling of toe of bilateral feet
- Swelling of toe of left foot
- Swelling of toe of right foot
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M25.475: its own notes plus those printed at M25.4, M25, block M00-M25, block M20-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
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M25.475, its category, or a range that includes it.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Effusion
a collection of fluid in a body cavity, which may be the result of a non-neoplastic disorder (e.g. heart failure) or a tumor (e.g. carcinoma of the lung).
Patient EducationClinical
Joint Disorders
Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.
The full article covers:
- What are joints?
- What are joint disorders?
- What diseases can affect the joints?
- What types of joint disorders happen from sudden injuries?
- What types of joint disorders happen from overuse?
- How can I keep my joints healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M25.475 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M25.475Overview
What is the ICD-10 code for effusion, left foot?
The ICD-10-CM code for effusion, left foot is M25.475 (sometimes written as M25475). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M25.475 (Effusion, ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report effusion, left foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M25.475 group to?
When effusion, left foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 566, 565, with relative weights from 0.7374 to 1.4909 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M25.475 be reported with A66.6?
Not as a rule. The Excludes1 note at M25.4, which applies to M25.475, lists "hydrarthrosis in yaws (A66.6)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of M25.475?
Under the General Equivalence Mappings, effusion, left foot converts to ICD-9-CM 719.07 (joint effusion-ankle). The mapping is approximate, so confirm the match fits the documentation.
