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  3. Diagnosis Codes in MS-DRG 122 - Acute Major Eye Infections Without CC/MCC

Diagnosis Codes in MS-DRG 122 - Acute Major Eye Infections Without CC/MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Acute Major Eye Infections without CC/MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 122

MS-DRG Title: Acute Major Eye Infections without CC/MCC

MCD: 02

Relative Weight: 0.6783 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 0.68 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 2.70 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

  • H04.01 - Acute dacryoadenitis

    • H04.011 - Acute dacryoadenitis, right lacrimal gland

    • H04.012 - Acute dacryoadenitis, left lacrimal gland

    • H04.013 - Acute dacryoadenitis, bilateral lacrimal glands

    • H04.019 - Acute dacryoadenitis, unspecified lacrimal gland

  • H04.32 - Acute dacryocystitis

    • H04.321 - Acute dacryocystitis of right lacrimal passage

    • H04.322 - Acute dacryocystitis of left lacrimal passage

    • H04.323 - Acute dacryocystitis of bilateral lacrimal passages

    • H04.329 - Acute dacryocystitis of unspecified lacrimal passage

  • H04.33 - Acute lacrimal canaliculitis

    • H04.331 - Acute lacrimal canaliculitis of right lacrimal passage

    • H04.332 - Acute lacrimal canaliculitis of left lacrimal passage

    • H04.333 - Acute lacrimal canaliculitis of bilateral lacrimal passages

    • H04.339 - Acute lacrimal canaliculitis of unspecified lacrimal passage

  • H05.01 - Cellulitis of orbit

    • H05.011 - Cellulitis of right orbit

    • H05.012 - Cellulitis of left orbit

    • H05.013 - Cellulitis of bilateral orbits

    • H05.019 - Cellulitis of unspecified orbit

  • H05.02 - Osteomyelitis of orbit

    • H05.021 - Osteomyelitis of right orbit

    • H05.022 - Osteomyelitis of left orbit

    • H05.023 - Osteomyelitis of bilateral orbits

    • H05.029 - Osteomyelitis of unspecified orbit

  • H05.03 - Periostitis of orbit

    • H05.031 - Periostitis of right orbit

    • H05.032 - Periostitis of left orbit

    • H05.033 - Periostitis of bilateral orbits

    • H05.039 - Periostitis of unspecified orbit

  • H05.04 - Tenonitis of orbit

    • H05.041 - Tenonitis of right orbit

    • H05.042 - Tenonitis of left orbit

    • H05.043 - Tenonitis of bilateral orbits

    • H05.049 - Tenonitis of unspecified orbit

  • H16.00 - Unspecified corneal ulcer

    • H16.001 - Unspecified corneal ulcer, right eye

    • H16.002 - Unspecified corneal ulcer, left eye

    • H16.003 - Unspecified corneal ulcer, bilateral

    • H16.009 - Unspecified corneal ulcer, unspecified eye

  • H16.01 - Central corneal ulcer

    • H16.011 - Central corneal ulcer, right eye

    • H16.012 - Central corneal ulcer, left eye

    • H16.013 - Central corneal ulcer, bilateral

    • H16.019 - Central corneal ulcer, unspecified eye

  • H16.03 - Corneal ulcer with hypopyon

    • H16.031 - Corneal ulcer with hypopyon, right eye

    • H16.032 - Corneal ulcer with hypopyon, left eye

    • H16.033 - Corneal ulcer with hypopyon, bilateral

    • H16.039 - Corneal ulcer with hypopyon, unspecified eye

  • H16.06 - Mycotic corneal ulcer

    • H16.061 - Mycotic corneal ulcer, right eye

    • H16.062 - Mycotic corneal ulcer, left eye

    • H16.063 - Mycotic corneal ulcer, bilateral

    • H16.069 - Mycotic corneal ulcer, unspecified eye

  • H16.07 - Perforated corneal ulcer

    • H16.071 - Perforated corneal ulcer, right eye

    • H16.072 - Perforated corneal ulcer, left eye

    • H16.073 - Perforated corneal ulcer, bilateral

    • H16.079 - Perforated corneal ulcer, unspecified eye

  • H16.31 - Corneal abscess

    • H16.311 - Corneal abscess, right eye

    • H16.312 - Corneal abscess, left eye

    • H16.313 - Corneal abscess, bilateral

    • H16.319 - Corneal abscess, unspecified eye

  • H21.33 - Parasitic cyst of iris, ciliary body or anterior chamber

    • H21.331 - Parasitic cyst of iris, ciliary body or anterior chamber, right eye

    • H21.332 - Parasitic cyst of iris, ciliary body or anterior chamber, left eye

    • H21.333 - Parasitic cyst of iris, ciliary body or anterior chamber, bilateral

    • H21.339 - Parasitic cyst of iris, ciliary body or anterior chamber, unspecified eye

  • H33.12 - Parasitic cyst of retina

    • H33.121 - Parasitic cyst of retina, right eye

    • H33.122 - Parasitic cyst of retina, left eye

    • H33.123 - Parasitic cyst of retina, bilateral

    • H33.129 - Parasitic cyst of retina, unspecified eye

  • H44.00 - Unspecified purulent endophthalmitis

    • H44.001 - Unspecified purulent endophthalmitis, right eye

    • H44.002 - Unspecified purulent endophthalmitis, left eye

    • H44.003 - Unspecified purulent endophthalmitis, bilateral

    • H44.009 - Unspecified purulent endophthalmitis, unspecified eye

  • H44.01 - Panophthalmitis (acute)

    • H44.011 - Panophthalmitis (acute), right eye

    • H44.012 - Panophthalmitis (acute), left eye

    • H44.013 - Panophthalmitis (acute), bilateral

    • H44.019 - Panophthalmitis (acute), unspecified eye

  • H44.02 - Vitreous abscess (chronic)

    • H44.021 - Vitreous abscess (chronic), right eye

    • H44.022 - Vitreous abscess (chronic), left eye

    • H44.023 - Vitreous abscess (chronic), bilateral

    • H44.029 - Vitreous abscess (chronic), unspecified eye

  • H44.1 - Other endophthalmitis

    • H44.19 - Other endophthalmitis

  • H44.12 - Parasitic endophthalmitis, unspecified

    • H44.121 - Parasitic endophthalmitis, unspecified, right eye

    • H44.122 - Parasitic endophthalmitis, unspecified, left eye

    • H44.123 - Parasitic endophthalmitis, unspecified, bilateral

    • H44.129 - Parasitic endophthalmitis, unspecified, unspecified eye