E77.1
Defects in glycoprotein degradation
E77.1 (also written E771) is a billable ICD-10-CM diagnosis code for defects in glycoprotein degradation. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category E77 (Disorders of glycoprotein metabolism). The Alphabetic Index lists it under 7 entries. Its coding notes include 6 Excludes1 entries and 1 Excludes2 entry.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (6 notes)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Inclusion terms
Conditions classified to this code.
- Aspartylglucosaminuria
- Fucosidosis
- Mannosidosis
- Sialidosis [mucolipidosis I]
Notes
Also from chapter/block level (1 note)
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 7 entries