2027 ICD-10-CM Diagnosis Code S99.129DSalter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing
S99.129D is a billable ICD-10-CM diagnosis code for Salter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing. The 7th character D means subsequent encounter for fracture with routine healing, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 949 through 950. The code is 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
Code Classification
Present on Admission (POA)Billing
S99.129D 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 S99.129D: its own notes plus those printed at S99.1, 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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Notes
General instructions on how these codes are used.
- 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.
- The appropriate 7th character is to be added to each code from subcategories S99.1
- Ainitial encounter for closed fracture
- Binitial encounter for open fracture
- Dsubsequent encounter for fracture with routine healing this code
- Gsubsequent encounter for fracture with delayed healing
- Ksubsequent encounter for fracture with nonunion
- 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 S99.129D, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming S99.129D: its condition is not part of those codes, and both may be reported when the patient has both.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Foot Injuries and Disorders
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Convert S99.129D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replacement S99.129D replaces the following previously assigned code(s):
- S92.009D - Unsp fracture of unsp calcaneus, subs for fx w routn heal
Questions About S99.129DOverview
Is S99.129D a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Salter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character D in S99.129D mean?
The final character D marks a subsequent encounter: use it for routine care while the Salter-Harris Type II physeal fracture of unspecified metatarsal is healing, after active treatment has ended. In this category the CMS Tabular List defines D as "subsequent encounter for fracture with routine healing".
What MS-DRG does S99.129D group to?
When Salter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S99.129D 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 Salter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.
What is the ICD-9 equivalent of S99.129D?
Under the General Equivalence Mappings, Salter-Harris Type II physeal fracture of unspecified metatarsal, subsequent encounter for fracture with routine healing converts to ICD-9-CM V54.16 (aftrcre traum fx low leg). The mapping is approximate, so confirm the match fits the documentation.
