ICD-10-CM Tabular Index · Chapter 12 · FY 2027 L49–L54
Urticaria and erythema (L49-L54) ICD-10-CM
The L49–L54 section covers urticaria and erythema with 37 ICD-10-CM diagnosis codes, of which 33 are billable in fiscal year 2027. The section is organized into the 6 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
6
Code Ranges
37
Diagnosis Codes
33
Billable Codes
L49–L54
Code Range
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the L49–L54 Code Range
These skin conditions involve redness, raised welts, or peeling. Urticaria means raised, red welts; erythema means skin redness.
L49 sorts peeling associated with redness by how much of the body’s surface is involved. L50 separates urticaria by type, including allergic, cold- and heat-related, and contact forms. L51 includes erythema multiforme, which can cause bull’s-eye-shaped skin lesions, and separates it from the named syndromes in that category.
L52 is erythema nodosum, which typically causes tender lumps on the shins. L53 groups other named conditions involving skin redness. L54 identifies erythema in diseases classified elsewhere.
Questions About This Page
How many codes are in the L49-L54 range?
The L49-L54 range contains 37 ICD-10-CM diagnosis codes in FY 2027. 33 of them are billable, and the rest are category headers that organize the section.
What conditions does L49-L54 cover?
The range covers urticaria and erythema. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
erythematous condition causing exfoliation, such as:
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code for adverse effect, if applicable, to identify drug T36T50
code to identify associated manifestations, such as:
arthropathy associated with dermatological disorders M14.8
code to identify percentage of skin exfoliation L49
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
