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ICD-10/L03.312

L03.312 ICD-10-CM Code: Cellulitis of back [any part except buttock and flank]

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 573 — SKIN GRAFT FOR SKIN ULCER OR CELLULITIS WITH MCC (MDC 09)
  • MS-DRG 574 — SKIN GRAFT FOR SKIN ULCER OR CELLULITIS WITH CC (MDC 09)
  • MS-DRG 575 — SKIN GRAFT FOR SKIN ULCER OR CELLULITIS WITHOUT CC/MCC (MDC 09)
  • MS-DRG 602 — CELLULITIS WITH MCC (MDC 09)
  • MS-DRG 603 — CELLULITIS WITHOUT MCC (MDC 09)
  • MS-DRG 791 — PREMATURITY WITH MAJOR PROBLEMS (MDC 15)
  • MS-DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Cellulitis of back [any part except buttock] is a billable ICD-10-CM diagnosis code (L03.312).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for L03.312 in the official ICD-10-CM tabular list.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • cellulitis of anal and rectal regions (K61.-)
  • cellulitis of breast NOS (N61.0)
  • cellulitis of female external genital organs (N76.4)
  • cellulitis of male external genital organs (N48.2, N49.-)
  • omphalitis of newborn (P38.-)
  • puerperal cellulitis of breast (O91.2)
  • cellulitis of anal and rectal region (K61.-)
  • cellulitis of external auditory canal (H60.1)
  • cellulitis of eyelid (H00.0)
  • cellulitis of lacrimal apparatus (H04.3)
  • cellulitis of mouth (K12.2)
  • cellulitis of nose (J34.0)
  • eosinophilic cellulitis Wells
  • febrile neutrophilic dermatosis Sweet
  • lymphangitis (chronic) (subacute) (I89.1)
  • hordeolum (H00.0)
  • infective dermatitis (L30.3)
  • local infections of skin classified in Chapter 1
  • lupus panniculitis (L93.2)
  • panniculitis NOS (M79.3)
  • panniculitis of neck and back (M54.0-)
  • Perlèche NOS (K13.0)
  • Perlèche due to candidiasis (B37.0)
  • Perlèche due to riboflavin deficiency (E53.0)
  • pyogenic granuloma (L98.0)
  • relapsing panniculitis Weber-Christian
  • viral warts (B07.-)
  • zoster (B02.-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code (B95-B97) to identify infectious agent.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to L03.312 in its code family, with their registry titles.

  • L03.221 — Cellulitis of neck
  • L03.222 — Acute lymphangitis of neck
  • L03.3 — Cellulitis and acute lymphangitis of trunk
  • L03.31 — Cellulitis of trunk
  • L03.311 — Cellulitis of abdominal wall
  • L03.313 — Cellulitis of chest wall
  • L03.314 — Cellulitis of groin
  • L03.315 — Cellulitis of perineum
  • L03.316 — Cellulitis of umbilicus
  • L03.317 — Cellulitis of buttock

View all codes in the L03 family

Indexed Clinical Terms (2)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative), back (any part except buttock and flank)
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative), trunk, back (any part except buttock and flank)