2026 ICD-10-CM Diagnosis Code T69.1XXSChilblains, sequela
T69.1XXS is a billable ICD-10-CM diagnosis code for chilblains, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. Coders also document this condition as chilblain lupus erythematosus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T69.1XXS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chilblain lupus erythematosus
- Chilblains
- Familial chilblain lupus erythematosus
- Local cold injury
- Pustular chilblain
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Other effects of reduced temperature (T69). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Chilblains
recurrent localized itching, swelling and painful erythema on the fingers, toes or ears, produced by exposure to cold.Chilblains
a rare condition characterized by skin inflammation, blister formation, swelling and ulcerations in the extremities. it occurs in persons exposed to cold temperatures.
Patient EducationClinical
Frostbite
Frostbite is an injury to the body that is caused by freezing. It most often affects the nose, ears, cheeks, chin, fingers, or toes. Frostbite can permanently damage the body, and severe cases can lead to amputation.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T69.1XXS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T69.1XXSOverview
Is T69.1XXS (Chilblains) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report chilblains, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T69.1XXS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the chilblains itself has resolved, not the original event.
What MS-DRG does T69.1XXS group to?
When chilblains, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T69.1XXS 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 chilblains, sequela on inpatient claims.
What is the ICD-9 equivalent of T69.1XXS?
Under the General Equivalence Mappings, chilblains, sequela converts to ICD-9-CM 909.4 (late eff cert ext cause). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
