All ICD10 Codes

DRG 121

Medical DRG

Acute Major Eye Infections with CC/MCC

TypeMedicalMDC02Dx Codes77

What is MS-DRG 121?

MS-DRG 121 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 02 (MDC 02) with a Complication or Comorbidity (CC). It maps to 77 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 1.1633 with a geometric mean length of stay of 4.1 days and an arithmetic mean of 5.5 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification
Medical DRG
Diagnosis-driven grouping
MDC
Major Diagnostic Category 02
Linked Codes
77 diagnosis
Billable Dx
100%
77 of 77 shown

FY 2026 Payment Data

Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).

Relative Weight
1.1633
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
4.1 days
Used for transfer payment calculations
Arithmetic Mean LOS
5.5 days
Average length of stay
Post-Acute Transfer
No
Not subject to the transfer policy

Related MS-DRGs in This Severity Group

The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.

DRGTitleRel. WeightGMLOS
121Acute Major Eye Infections with CC/MCCThis page1.16334.1 days
122Acute Major Eye Infections without CC/MCC0.78583.2 days

Linked ICD-10-CM Diagnosis Mappings

  • H04.011

    Acute dacryoadenitis, right lacrimal gland

    BillableChapter 7
  • H04.012

    Acute dacryoadenitis, left lacrimal gland

    BillableChapter 7
  • H04.013

    Acute dacryoadenitis, bilateral lacrimal glands

    BillableChapter 7
  • H04.019

    Acute dacryoadenitis, unspecified lacrimal gland

    BillableChapter 7
  • H04.321

    Acute dacryocystitis of right lacrimal passage

    BillableChapter 7
  • H04.322

    Acute dacryocystitis of left lacrimal passage

    BillableChapter 7
  • H04.323

    Acute dacryocystitis of bilateral lacrimal passages

    BillableChapter 7
  • H04.329

    Acute dacryocystitis of unspecified lacrimal passage

    BillableChapter 7
  • H04.331

    Acute lacrimal canaliculitis of right lacrimal passage

    BillableChapter 7
  • H04.332

    Acute lacrimal canaliculitis of left lacrimal passage

    BillableChapter 7
  • H04.333

    Acute lacrimal canaliculitis of bilateral lacrimal passages

    BillableChapter 7
  • H04.339

    Acute lacrimal canaliculitis of unspecified lacrimal passage

    BillableChapter 7
  • H05.011

    Cellulitis of right orbit

    BillableChapter 7
  • H05.012

    Cellulitis of left orbit

    BillableChapter 7
  • H05.013

    Cellulitis of bilateral orbits

    BillableChapter 7
  • H05.019

    Cellulitis of unspecified orbit

    BillableChapter 7
  • H05.021

    Osteomyelitis of right orbit

    BillableChapter 7
  • H05.022

    Osteomyelitis of left orbit

    BillableChapter 7
  • H05.023

    Osteomyelitis of bilateral orbits

    BillableChapter 7
  • H05.029

    Osteomyelitis of unspecified orbit

    BillableChapter 7
  • H05.031

    Periostitis of right orbit

    BillableChapter 7
  • H05.032

    Periostitis of left orbit

    BillableChapter 7
  • H05.033

    Periostitis of bilateral orbits

    BillableChapter 7
  • H05.039

    Periostitis of unspecified orbit

    BillableChapter 7
  • H05.041

    Tenonitis of right orbit

    BillableChapter 7
  • H05.042

    Tenonitis of left orbit

    BillableChapter 7
  • H05.043

    Tenonitis of bilateral orbits

    BillableChapter 7
  • H05.049

    Tenonitis of unspecified orbit

    BillableChapter 7
  • H16.001

    Unspecified corneal ulcer, right eye

    BillableChapter 7
  • H16.002

    Unspecified corneal ulcer, left eye

    BillableChapter 7
  • H16.003

    Unspecified corneal ulcer, bilateral

    BillableChapter 7
  • H16.009

    Unspecified corneal ulcer, unspecified eye

    BillableChapter 7
  • H16.011

    Central corneal ulcer, right eye

    BillableChapter 7
  • H16.012

    Central corneal ulcer, left eye

    BillableChapter 7
  • H16.013

    Central corneal ulcer, bilateral

    BillableChapter 7
  • H16.019

    Central corneal ulcer, unspecified eye

    BillableChapter 7
  • H16.031

    Corneal ulcer with hypopyon, right eye

    BillableChapter 7
  • H16.032

    Corneal ulcer with hypopyon, left eye

    BillableChapter 7
  • H16.033

    Corneal ulcer with hypopyon, bilateral

    BillableChapter 7
  • H16.039

    Corneal ulcer with hypopyon, unspecified eye

    BillableChapter 7
  • H16.061

    Mycotic corneal ulcer, right eye

    BillableChapter 7
  • H16.062

    Mycotic corneal ulcer, left eye

    BillableChapter 7
  • H16.063

    Mycotic corneal ulcer, bilateral

    BillableChapter 7
  • H16.069

    Mycotic corneal ulcer, unspecified eye

    BillableChapter 7
  • H16.071

    Perforated corneal ulcer, right eye

    BillableChapter 7
  • H16.072

    Perforated corneal ulcer, left eye

    BillableChapter 7
  • H16.073

    Perforated corneal ulcer, bilateral

    BillableChapter 7
  • H16.079

    Perforated corneal ulcer, unspecified eye

    BillableChapter 7
  • H16.311

    Corneal abscess, right eye

    BillableChapter 7
  • H16.312

    Corneal abscess, left eye

    BillableChapter 7
  • H16.313

    Corneal abscess, bilateral

    BillableChapter 7
  • H16.319

    Corneal abscess, unspecified eye

    BillableChapter 7
  • H21.331

    Parasitic cyst of iris, ciliary body or anterior chamber, right eye

    BillableChapter 7
  • H21.332

    Parasitic cyst of iris, ciliary body or anterior chamber, left eye

    BillableChapter 7
  • H21.333

    Parasitic cyst of iris, ciliary body or anterior chamber, bilateral

    BillableChapter 7
  • H21.339

    Parasitic cyst of iris, ciliary body or anterior chamber, unspecified eye

    BillableChapter 7
  • H33.121

    Parasitic cyst of retina, right eye

    BillableChapter 7
  • H33.122

    Parasitic cyst of retina, left eye

    BillableChapter 7
  • H33.123

    Parasitic cyst of retina, bilateral

    BillableChapter 7
  • H33.129

    Parasitic cyst of retina, unspecified eye

    BillableChapter 7
  • H44.001

    Unspecified purulent endophthalmitis, right eye

    BillableChapter 7
  • H44.002

    Unspecified purulent endophthalmitis, left eye

    BillableChapter 7
  • H44.003

    Unspecified purulent endophthalmitis, bilateral

    BillableChapter 7
  • H44.009

    Unspecified purulent endophthalmitis, unspecified eye

    BillableChapter 7
  • H44.011

    Panophthalmitis (acute), right eye

    BillableChapter 7
  • H44.012

    Panophthalmitis (acute), left eye

    BillableChapter 7
  • H44.013

    Panophthalmitis (acute), bilateral

    BillableChapter 7
  • H44.019

    Panophthalmitis (acute), unspecified eye

    BillableChapter 7
  • H44.021

    Vitreous abscess (chronic), right eye

    BillableChapter 7
  • H44.022

    Vitreous abscess (chronic), left eye

    BillableChapter 7
  • H44.023

    Vitreous abscess (chronic), bilateral

    BillableChapter 7
  • H44.029

    Vitreous abscess (chronic), unspecified eye

    BillableChapter 7
  • H44.121

    Parasitic endophthalmitis, unspecified, right eye

    BillableChapter 7
  • H44.122

    Parasitic endophthalmitis, unspecified, left eye

    BillableChapter 7
  • H44.123

    Parasitic endophthalmitis, unspecified, bilateral

    BillableChapter 7
  • H44.129

    Parasitic endophthalmitis, unspecified, unspecified eye

    BillableChapter 7
  • H44.19

    Other endophthalmitis

    BillableChapter 7