2027 ICD-10-CM Diagnosis Code E34.321Primary insulin-like growth factor-1 (IGF-1) deficiency

ICD-10-CM Codes›E00–E89›E20-E35›E34

ICD-10-CM E34.321
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

E34.321 is a billable ICD-10-CM diagnosis code for primary insulin-like growth factor-1 (IGF-1) deficiency. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 643 through 645. Coders also document this condition as growth delay due to insulin-like growth factor type 1 deficiency. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.

Code Identity

ICD-10-CM Code
E34.321
Billable Status
Yes — Valid for Submission
Code Describes
Primary insulin-like growth factor-1 (IGF-1) deficiency
Short Description
Primary insulin-like growth factor-1 (IGF-1) deficiency
Same as the full description in the CMS dataset.
Parent Code
E34.32
Genetic causes of short stature

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE20-E35Disorders of other endocrine glands
CategoryE34Other endocrine disorders
This CodeE34.321Primary insulin-like growth factor-1 (IGF-1) deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Growth delay due to insulin-like growth factor type 1 deficiency
  • Growth hormone receptor abnormality
  • Growth hormone receptor absent
  • Hereditary growth hormone deficiency
  • Laron syndrome with immunodeficiency
  • Laron-type isolated somatotropin defect
  • Short stature due to primary acid labile subunit deficiency

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to E34.321: its own notes plus those printed at E34.3, E34, block E20-E35, and Chapter 4. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Acid-labile subunit gene (IGFALS) defect
  • Growth hormone gene 1 (GH1) defect with growth hormone neutralizing antibodies
  • Growth hormone insensitivity syndrome (GHIS)
  • Insulin-like growth factor 1 gene (IGF1) defect
  • Laron type short stature
  • Severe primary insulin-like growth factor-1 deficiency (SPIGFD)
  • Signal transducer and activator of transcription 5B gene (STAT5b) defect

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From E34.3 Short stature due to endocrine disorder applies to 7 codes
  • achondroplastic short stature (Q77.4)
  • hypochondroplastic short stature (Q77.4)
  • nutritional short stature (E45)
  • pituitary short stature (E23.0)
  • progeria (E34.8)
  • renal short stature (N25.0)
  • Russell-Silver syndrome (Q87.19)
  • short-limbed stature with immunodeficiency (D82.2)
  • short stature (child) (R62.52)
  • short stature in specific dysmorphic syndromes - code to syndrome - see Alphabetical Index
  • short stature NOS (R62.52)
From E34 Other endocrine disorders applies to 18 codes
  • pseudohypoparathyroidism (E20.1)
From Block E20-E35 Disorders of other endocrine glands applies to 99 codes
From Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases applies to 973 codes
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Notes

General instructions on how these codes are used.

From Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases applies to 973 codes
  • 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.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name E34.321, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming E34.321: they are not reported together with it, unless the two conditions are unrelated.

  • E23 Hypofunction and other disorders of the pituitary gland
    short stature due to endocrine disorder (E34.3-) names E34.3-, which includes this code
  • R62.52 Short stature (child)
    short stature due to endocrine disorder (E34.3-) names E34.3-, which includes this code

Code First 1

These codes say to code first a condition named in the note, and E34.321 is one of the conditions named.

  • G63 Polyneuropathy in diseases classified elsewhere
    endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34) names E20-E34, which includes this code

Notes 1

These notes mention E34.321.

  • Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases
    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. names E34.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END015
Other specified and unspecified endocrine disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Growth Disorders

Does your child seem much shorter - or much taller - than other kids his or her age? It could be normal. Some children may be small for their age but still be developing normally. Some children are short or tall because their parents are.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement E34.321 replaces the following previously assigned code(s):

  • E34.3 - Short stature due to endocrine disorder
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About E34.321Overview

What is the ICD-10 code for primary insulin-like growth factor-1 (IGF-1) deficiency?

The ICD-10-CM code for primary insulin-like growth factor-1 (IGF-1) deficiency is E34.321 (sometimes written as E34321). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is E34.321 (Genetic causes of short stature) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report primary insulin-like growth factor-1 (IGF-1) deficiency on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does E34.321 group to?

When primary insulin-like growth factor-1 (IGF-1) deficiency is the principal diagnosis on an inpatient stay, it groups to MS-DRG 644, 645, 643, with relative weights from 0.7461 to 1.6138 depending on complications. Higher weights mean higher Medicare reimbursement.

Can E34.321 be reported with Q77.4?

Not as a rule. The Excludes1 note at E34.3, which applies to E34.321, lists "achondroplastic short stature (Q77.4)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).