2027 ICD-10-CM Diagnosis Code M35.6Relapsing panniculitis [Weber-Christian]
ICD-10-CM Codes›M00–M99›M30-M36›M35
- Billable — Valid for Submission
- Chronic Condition
M35.6 is a billable ICD-10-CM diagnosis code for relapsing panniculitis [Weber-Christian]. 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. Coders also document this condition as nodular panniculitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Nodular panniculitis
- Relapsing febrile nodular nonsuppurative panniculitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M35.6: its own notes plus those printed at M35, block M30-M36, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- autoimmune disease NOS
- collagen (vascular) disease NOS
- systemic autoimmune disease
- systemic collagen (vascular) disease
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- reactive perforating collagenosis (L87.1)
- autoimmune disease, single organ or single cell-type -code to relevant condition category
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.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M35.6, its category, or a range that includes it.
Excludes1 5
These codes carry an Excludes1 note naming M35.6: they are not reported together with it, unless the two conditions are unrelated.
- L95 Vasculitis limited to skin, not elsewhere classifiedrelapsing panniculitis (M35.6)
- M54.0 Panniculitis affecting regions of neck and backrelapsing [Weber-Christian] panniculitis (M35.6)
- M79.3 Panniculitis, unspecifiedrelapsing [Weber-Christian] panniculitis (M35.6)
- Q87.A Loeys-Dietz syndromeother systemic involvement of connective tissue (M35) names M35, which includes this code
- L94 Other localized connective tissue disorders
Excludes2 5
These codes carry an Excludes2 note naming M35.6: its condition is not part of those codes, and both may be reported when the patient has both.
- Block L00-L08 Infections of the skin and subcutaneous tissuerelapsing panniculitis [Weber-Christian] (M35.6)
- Chapter 9 (I00-I99) Diseases of the circulatory system
- I77 Other disorders of arteries and arterioles
- J82 Pulmonary eosinophilia, not elsewhere classified
- Chapter 12 (L00-L99) Diseases of the skin and subcutaneous tissue
Code First 1
These codes say to code first a condition named in the note, and M35.6 is one of the conditions named.
- J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Christian-Weber disease M35.6
Weber-Christian disease M35.6
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Panniculitis, Nodular Nonsuppurative
a form of panniculitis characterized by recurrent episodes of fever accompanied by the eruption of single or multiple erythematous subcutaneous nodules on the lower extremities. they normally resolve, but tend to leave depressions in the skin. the condition is most often seen in women, alone or in association with other disorders.
Patient EducationClinical
Connective Tissue Disorders
Your connective tissue supports many different parts of your body, such as your skin, eyes, and heart. It is like a "cellular glue" that gives your body parts their shape and helps keep them strong. It also helps some of your tissues do their work. It is made of many kinds of proteins. Cartilage and fat are types of connective tissue.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M35.6 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M35.6Overview
What is the ICD-10 code for relapsing panniculitis [Weber-Christian]?
The ICD-10-CM code for relapsing panniculitis [Weber-Christian] is M35.6 (sometimes written as M356). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M35.6 (Other systemic involvement of connective tissue) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report relapsing panniculitis [Weber-Christian] on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M35.6 group to?
When relapsing panniculitis [Weber-Christian] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M35.6 be reported with L93.2?
Not as a rule. The Excludes1 note on M35.6 lists "lupus panniculitis (L93.2)". 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 the ICD-9 equivalent of M35.6?
Under the General Equivalence Mappings, relapsing panniculitis [Weber-Christian] converts to ICD-9-CM 729.30 (panniculitis, unsp site). The mapping is approximate, so confirm the match fits the documentation.
