Skip to main content

S83.013 vs S83.014

S83.013 (Lateral subluxation of unspecified patella) compared with S83.014 (Lateral dislocation of right patella), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes represent different levels of specificity within category S83: S83.014 is the more specific code and S83.013 is the unspecified one.

MedCoder-derived
What is different?

Title wording.The titles share “Lateral … patella”; S83.013 says “subluxation of unspecified” where S83.014 says “dislocation of right”.

Registry fact

Can these codes be reported together?

Not ordinarily.S83.014 is the more specific code and S83.013 is the unspecified one, in the same category. When the documentation supports the more specific code, the unspecified code is not added for the same condition (ICD-10-CM Official Guidelines, Section I.B.18).

MedCoder-derivedGuide: Other vs unspecified (NEC vs NOS)

Is one more specific?

Yes.S83.014’s title names the condition; S83.013’s title is the unspecified form (“Lateral subluxation of unspecified patella”).

MedCoder-derivedGuide: Other vs unspecified (NEC vs NOS)

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Nothing found in 4 other checks
Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. S83.013 carries 11 Excludes2 notes and S83.014 carries 11 Excludes2 notes covering other codes; the side-by-side table quotes them.

Official rule

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Review

Specificity relationship

S83.013
Lateral subluxation of unspecified patella
↔
S83.014
Lateral dislocation of right patella

What we found

Not ordinarily reported together for the same condition. No Excludes1/Excludes2 relationship is listed between S83.013 and S83.014, but they describe overlapping diagnoses in the same category (Both are children of the same S83 category.).

When documentation supports the more specific code, the unspecified code should generally not be added for the same condition (ICD-10-CM Official Guidelines, Section I.B.18).

What to review

When the documentation supports the more specific code, report it and leave the unspecified code off for the same condition.

Guide: Other vs unspecified (NEC vs NOS)Check these on a claim

Why it matters

No Excludes note links these codes, but they describe overlapping diagnoses and one of them is unspecified. When documentation supports the more specific code, the unspecified code should generally not be added for the same condition.

Source / rule

ICD-10-CM Official Guidelines, Section I.B.18

Official guidance behind these answers

  • Section I.B.18 — Use of Sign/Symptom/Unspecified Codes · applies to: Unspecified codes

    Sign/symptom and “unspecified” codes have acceptable, even necessary, uses. While specific diagnosis codes should be reported when they are supported by the available medical record documentation and clinical knowledge of the patient’s health condition, there are instances when signs/symptoms or unspecified codes are the best choices for accurately reflecting the healthcare encounter. Each healthcare encounter should be coded to the level of certainty known for that encounter. As stated in the introductory section of these official coding guidelines, a joint effort between the healthcare provider and the coder is essential to achieve complete and accurate documentation, code assignment, and reporting of diagnoses and procedures. The importance of consistent, complete documentation in the medical record cannot be overemphasized. Without such documentation accurate coding cannot be achieved. The entire record should be reviewed to determine the specific reason for the encounter and the conditions treated. If a definitive diagnosis has not been established by the end of the encounter, it is appropriate to report codes for sign(s) and/or symptom(s) in lieu of a definitive diagnosis. When sufficient clinical information isn’t known or available about a particular health condition to assign a more specific code, it is acceptable to report the appropriate “unspecified” code (e.g., a diagnosis of pneumonia has been determined, but not the specific type). […]

    ICD-10-CM Official Guidelines FY2027

  • Section I.B.2 — Level of Detail in Coding · applies to: Level of detail

    Diagnosis codes are to be used and reported at their highest number of characters available and to the highest level of specificity documented in the medical record. ICD-10-CM diagnosis codes are composed of codes with 3, 4, 5, 6 or 7 characters. Codes with three characters are included in ICD-10-CM as the heading of a category of codes that may be further subdivided by the use of fourth and/or fifth characters and/or sixth characters, which provide greater detail. A three-character code is to be used only if it is not further subdivided. A code is invalid if it has not been coded to the full number of characters required for that code, including the 7th character, if applicable.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
S83.013

Lateral subluxation of unspecified patella

S83.014

Lateral dislocation of right patella

StatusDiffers
S83.013
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: S83.013A, S83.013D, S83.013S

S83.014
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: S83.014A, S83.014D, S83.014S

Excludes2Same for both
  • derangement of patella (M22.0-M22.3)
  • injury of patellar ligament (tendon) (S76.1-)
  • internal derangement of knee (M23.-)
  • old dislocation of knee (M24.36)
  • pathological dislocation of knee (M24.36)
  • recurrent dislocation of knee (M22.0)
  • strain of muscle, fascia and tendon of lower leg (S86.-)
  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
  • insect bite or sting, venomous (T63.4)
Code alsoSame for both
  • any associated open wound
CategorySame for both

S83 Dislocation and sprain of joints and ligaments of knee

ChapterSame for both

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesSame for both
  • avulsion of joint or ligament of knee
  • laceration of cartilage, joint or ligament of knee
  • sprain of cartilage, joint or ligament of knee
  • traumatic hemarthrosis of joint or ligament of knee
  • traumatic rupture of joint or ligament of knee
  • traumatic subluxation of joint or ligament of knee
  • traumatic tear of joint or ligament of knee
7th characterSame for both
  • The appropriate 7th character is to be added to each code from category S83

No Excludes1, Code first and Use additional code note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.

Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources