FY2027 ICD-10-CM reference
L03.312: Cellulitis of back [any part except buttock and flank]
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Cellulitis of back [any part except buttock and flank]. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: L00-L99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: L00-L99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: L00-L99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: L00-L99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: L00-L99 (chapter, inherited).
Excludes2
lipomelanotic reticulosis (I89.8)
Source: L00-L99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: L00-L99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: L00-L99 (chapter, inherited).
Excludes2
systemic connective tissue disorders (M30-M36)
Source: L00-L99 (chapter, inherited).
Excludes2
viral warts (B07.-)
Source: L00-L99 (chapter, inherited).
Instructional note
code (B95-B97) to identify infectious agent.
Source: L00-L08 (section, inherited).
Excludes2
hordeolum (H00.0)
Source: L00-L08 (section, inherited).
Excludes2
infective dermatitis (L30.3)
Source: L00-L08 (section, inherited).
Excludes2
local infections of skin classified in Chapter 1
Source: L00-L08 (section, inherited).
Excludes2
lupus panniculitis (L93.2)
Source: L00-L08 (section, inherited).
Excludes2
panniculitis NOS (M79.3)
Source: L00-L08 (section, inherited).
Excludes2
panniculitis of neck and back (M54.0-)
Source: L00-L08 (section, inherited).
Excludes2
Perlèche NOS (K13.0)
Source: L00-L08 (section, inherited).
Excludes2
Perlèche due to candidiasis (B37.0)
Source: L00-L08 (section, inherited).
Excludes2
Perlèche due to riboflavin deficiency (E53.0)
Source: L00-L08 (section, inherited).
Excludes2
pyogenic granuloma (L98.0)
Source: L00-L08 (section, inherited).
Excludes2
relapsing panniculitis [Weber-Christian] (M35.6)
Source: L00-L08 (section, inherited).
Excludes2
viral warts (B07.-)
Source: L00-L08 (section, inherited).
Excludes2
zoster (B02.-)
Source: L00-L08 (section, inherited).
Excludes2
cellulitis of anal and rectal region (K61.-)
Source: L03 (category, inherited).
Excludes2
cellulitis of external auditory canal (H60.1)
Source: L03 (category, inherited).
Excludes2
cellulitis of eyelid (H00.0)
Source: L03 (category, inherited).
Excludes2
cellulitis of female external genital organs (N76.4)
Source: L03 (category, inherited).
Excludes2
cellulitis of lacrimal apparatus (H04.3)
Source: L03 (category, inherited).
Excludes2
cellulitis of male external genital organs (N48.2, N49.-)
Source: L03 (category, inherited).
Excludes2
cellulitis of mouth (K12.2)
Source: L03 (category, inherited).
Excludes2
cellulitis of nose (J34.0)
Source: L03 (category, inherited).
Excludes2
eosinophilic cellulitis [Wells] (L98.3)
Source: L03 (category, inherited).
Excludes2
febrile neutrophilic dermatosis [Sweet] (L98.2)
Source: L03 (category, inherited).
Excludes2
lymphangitis (chronic) (subacute) (I89.1)
Source: L03 (category, inherited).
Excludes2
cellulitis of anal and rectal regions (K61.-)
Source: L03.31 (self, inherited).
Excludes2
cellulitis of breast NOS (N61.0)
Source: L03.31 (self, inherited).
Excludes2
cellulitis of female external genital organs (N76.4)
Source: L03.31 (self, inherited).
Excludes2
cellulitis of male external genital organs (N48.2, N49.-)
Source: L03.31 (self, inherited).
Excludes2
omphalitis of newborn (P38.-)
Source: L03.31 (self, inherited).
Excludes2
puerperal cellulitis of breast (O91.2)
Source: L03.31 (self, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does L03.312 mean in FY2027?
The official ICD-10-CM descriptor is Cellulitis of back [any part except buttock and flank]. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is L03.312 billable in FY2027?
The FY2027 order file marks L03.312 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does L03.312 map to an HCC?
L03.312 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: no ESRD category; no RxHCC category. Coefficients for these models are pending verification for payment year 2027. HHS-HCC: no category in the HHS-HCC 2026 benefit year mapping. CMS-HCC V24: not used for payment year 2027 Medicare Advantage payment (CMS CY 2027 Rate Announcement). The PACE mapping is still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition