Alphabetic Index FY2027

P05.09

Newborn light for gestational age, 2500 grams and over

FY2027Chapter 16: Certain conditions originating in the perinatal period/P05–P08 Disorders of newborn related to length of gestation and fetal growth

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Other

P05.09 (also written P0509) is a billable ICD-10-CM diagnosis code for newborn light for gestational age, 2500 grams and over. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 22 codes in category P05 (Disorders of newborn related to slow fetal growth and fetal malnutrition). The Alphabetic Index lists it under 2 entries. Its coding notes include 5 Excludes2 entries.

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Chapter 16 codes are never used on the maternal record, and chapter 15 codes are never used on the newborn record. Chapter 16 codes can be used for life if the condition persists.

Guidelines I.C.16.a.1Perinatal codes and the maternal recordRead the official text

Prematurity is coded only when documented. When birth weight and gestational age are both available, two P07 codes are assigned, weight first. P07 can also apply to an older child or adult whose health is still affected.

Guidelines I.C.16.d; I.C.16.ePrematurity and low birth weight (P05, P07)Read the official text

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (5 notes)
Inherited from Chapter 16 Certain conditions originating in the perinatal period
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

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, 2026

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (1 note)
Inherited from Chapter 16 Certain conditions originating in the perinatal period
  • conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later

Inclusion terms

Conditions classified to this code.

This code
  • Newborn light for gestational age, other

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 16 Certain conditions originating in the perinatal period
  • Codes from this chapter are for use on newborn records only, never on maternal records

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries