2027 ICD-10-CM Diagnosis Code S92.046KNondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion

ICD-10-CM Codes›S00–T88›S90-S99›S92

ICD-10-CM S92.046K
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S92.046K is a billable ICD-10-CM diagnosis code for nondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion. The 7th character K means subsequent encounter for fracture with nonunion. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 5,561 closely related codes. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fracture of lower limb (except hip), subsequent encounter.

Code Identity

ICD-10-CM Code
S92.046K
Billable Status
Yes — Valid for Submission
Code Describes
Nondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion
Short Description
Nondisp oth fx tuberosity of unsp calcaneus, 7thK
Parent Code
S92.046
Nondisplaced other fracture of tuberosity of unspecified calcaneus

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS90-S99Injuries to the ankle and foot
CategoryS92Fracture of foot and toe, except ankle
This CodeS92.046KNondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion

Code EditsBilling

Medicare Code Editor checks that affect claim validity for S92.046K.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Present on Admission (POA)Billing

S92.046K is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the ankle and foot (S90-S99).

Coding GuidelinesGuidance

The principles of multiple coding of injuries should be followed in coding fractures. Fractures of specified sites are coded individually by site, to the level of detail furnished by medical record content.

A fracture not indicated as open or closed should be coded to closed. A fracture not indicated whether displaced or not displaced should be coded to displaced.

Initial vs. Subsequent Encounter for Fractures

Traumatic fractures are coded using the appropriate 7th character for initial encounter (A, B, C) while the patient is receiving active treatment for the fracture. The appropriate 7th character for initial encounter should also be assigned for a patient who delayed seeking treatment for the fracture or nonunion.

Fractures are coded using the appropriate 7th character for subsequent care for encounters after the patient has completed active treatment of the fracture and is receiving routine care for the fracture during the healing or recovery phase.

Care for complications of surgical treatment for fracture repairs during the healing or recovery phase should be coded with the appropriate complication codes.

Care of complications of fractures, such as malunion and nonunion, should be reported with the appropriate 7th character for subsequent care with nonunion (K, M, N) or subsequent care with malunion (P, Q, R).

The open fracture designations in the assignment of the 7th character for fractures of the forearm, femur and lower leg, including ankle are based on the Gustilo open fracture classification. When the Gustilo classification type is not specified for an open fracture, the 7th character for open fracture type I or II should be assigned (B, E, H, M, Q).

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S92.046K: its own notes plus those printed at S92.0, S92, block S90-S99, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

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.

From S92.0 Fracture of calcaneus applies to 273 codes
  • Physeal fracture of calcaneus (S99.0-)
From S92 Fracture of foot and toe, except ankle applies to 1,386 codes
  • fracture of ankle (S82.-)
  • fracture of malleolus (S82.-)
  • traumatic amputation of ankle and foot (S98.-)
From Block S90-S99 Injuries to the ankle and foot applies to 3,324 codes
  • burns and corrosions (T20-T32)
  • fracture of ankle and malleolus (S82.-)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From S92 Fracture of foot and toe, except ankle applies to 1,386 codes
  • A fracture not indicated as displaced or nondisplaced should be coded to displaced
  • A fracture not indicated as open or closed should be coded to closed
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S92 Fracture of foot and toe, except ankle applies to 1,386 codes
  • The appropriate 7th character is to be added to each code from category S92
Values for category S92 Open or Closed Fracture Encounter
  • Ainitial encounter for closed fracture
  • Binitial encounter for open fracture
  • Dsubsequent encounter for fracture with routine healing
  • Gsubsequent encounter for fracture with delayed healing
  • Ksubsequent encounter for fracture with nonunion this code
  • Psubsequent encounter for fracture with malunion
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S92.046K, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming S92.046K: they are not reported together with it, unless the two conditions are unrelated.

  • M84.3 Stress fracture
    traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-) names S92.-, which includes this code
  • M84.4 Pathological fracture, not elsewhere classified
    traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-) names S92.-, which includes this code
  • S91 Open wound of ankle, foot and toes
    open fracture of ankle, foot and toes (S92.-with 7th character B) names S92, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming S92.046K: its condition is not part of those codes, and both may be reported when the patient has both.

  • S72 Fracture of femur
    fracture of foot (S92.-) names S92.-, which includes this code
  • S82 Fracture of lower leg, including ankle
    fracture of foot, except ankle (S92.-) names S92.-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ042
Fracture of lower limb (except hip), subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Fractures

A fracture is a break in a bone. Fractures are usually caused by injuries. Since they can sometimes be serious, it's important to get medical care right away if you think you have a fracture.

The full article covers:

  • What is a fracture?
  • What are the different types of fractures?
  • What causes fractures?
  • What are the symptoms of a fracture?
  • How are fractures diagnosed?
  • What are the treatments for fractures?
  • Can fractures be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S92.046K to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
733.82 Nonunion of fracture
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S92.046KOverview

Is S92.046K a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character K in S92.046K mean?

The final character K reports a subsequent encounter where the nondisplaced other fracture of tuberosity of unspecified calcaneus has failed to heal, called a nonunion. In this category the CMS Tabular List defines K as "subsequent encounter for fracture with nonunion".

What MS-DRG does S92.046K group to?

When nondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion 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.

Is S92.046K a CC or MCC?

CMS lists S92.046K as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 5,561 closely related codes in its exclusion list.

Is S92.046K exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for nondisplaced other fracture of tuberosity of unspecified calcaneus, subsequent encounter for fracture with nonunion on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.