2027 ICD-10-CM Diagnosis Code L99Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
ICD-10-CM Codes›L00–L99›L80-L99›L99
- Billable — Valid for Submission
- Not Chronic
L99 is a billable ICD-10-CM diagnosis code for other disorders of skin and subcutaneous tissue in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for L99.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute Chagas' disease
- African trypanosomiasis affecting skin
- Amyloidosis cutis dyschromia
- Amyloidosis limited to skin
- Behcet disease of skin
- Chagas' exanthem
- Cutaneous complication of rheumatoid disease
- Cutaneous complication of systemic sclerosis
- Dermatosis resulting from vascular insufficiency
- Disorder of skin co-occurrent with human immunodeficiency virus infection
- Disorder of skin due to human immunodeficiency virus infection
- Human immunodeficiency virus modified skin disease
- Metabolic and nutritional disorders affecting skin
- Non-specific cutaneous reaction in Hodgkin's disease
- Primary localized cutaneous amyloidosis
- Rheumatoid neutrophilic dermatitis
- Skin disorder with AIDS
- Skin involvement in bacterial endocarditis
- Skin lesion in drug addict
- Small vessel thrombosis of skin
- Spinal cord defect affecting skin
- Systemic disease affecting skin
- Trypanosomiasis affecting skin
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L99: its own notes plus those printed at Chapter 12. A note printed at a category, block or chapter applies to every code under it.
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.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- lipomelanotic reticulosis (I89.8)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- viral warts (B07.-)
Code First
The underlying condition named in the note is sequenced before this code.
- underlying disease, such as:
- amyloidosis (E85.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Skin Conditions
Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:
The full article covers:
- What does your skin do?
- What problems and conditions can affect your skin?
- How can I keep my skin healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L99 to ICD-9-CMHistory
Code HistoryHistory
Questions About L99Overview
Is L99 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of skin and subcutaneous tissue in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L99 group to?
On inpatient claims, other disorders of skin and subcutaneous tissue in diseases classified elsewhere maps to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
Can L99 be a principal diagnosis?
No. This is a manifestation code: other disorders of skin and subcutaneous tissue in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
Can L99 be reported with A54.89?
Not as a rule. The Excludes1 note on L99 lists "skin disorders in gonorrhea (A54.89)". 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 coded first with L99?
The Code First note reads: underlying disease, such as: amyloidosis (E85.-). When one of these applies, it is sequenced before L99.
