2027 ICD-10-CM Diagnosis Code E34.2Ectopic hormone secretion, not elsewhere classified
ICD-10-CM Codes›E00–E89›E20-E35›E34
- Billable — Valid for Submission
- Chronic Condition
E34.2 is a billable ICD-10-CM diagnosis code for ectopic hormone secretion, not elsewhere classified. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aberrant parathyroid gland
- Congenital anomaly of parathyroid glands
- Ectopic aldosterone secretion
- Ectopic aldosterone-producing neoplasm
- Ectopic antidiuretic hormone secretion
- Ectopic calcitonin production
- Ectopic GHRH secretion causing acromegaly
- Ectopic growth hormone secretion
- Ectopic human chorionic gonadotropin secretion
- Ectopic hyperparathyroidism
- Ectopic parathyroid hormone-related protein secretion
- Ectopic production of endocrine substance
- Ectopic prolactin secretion
- Ectopic renin secretion
- Ectopic thymus secretion
- Parathyromatosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E34.2: its own notes plus those printed at E34, block E20-E35, and Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- ectopic ACTH syndrome (E24.3)
Notes
General instructions on how these codes are used.
- 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 E34.2, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming E34.2: they are not reported together with it, unless the two conditions are unrelated.
- E21 Hyperparathyroidism and other disorders of parathyroid glandectopic hyperparathyroidism (E34.2)
Code First 1
These codes say to code first a condition named in the note, and E34.2 is one of the conditions named.
- G63 Polyneuropathy in diseases classified elsewhere
Notes 1
These notes mention E34.2.
- Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseasesAll 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.
ectopic NEC E34.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Endocrine Diseases
Your endocrine system includes eight major glands throughout your body. These glands make hormones. Hormones are chemical messengers. They travel through your bloodstream to tissues or organs. Hormones work slowly and affect body processes from head to toe. These include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E34.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E34.2Overview
What is the ICD-10 code for ectopic hormone secretion, not elsewhere classified?
The ICD-10-CM code for ectopic hormone secretion, not elsewhere classified is E34.2 (sometimes written as E342). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E34.2 (Other endocrine disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report ectopic hormone secretion, not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E34.2 group to?
When ectopic hormone secretion, not elsewhere classified 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 E34.2 be reported with E24.3?
Not as a rule. The Excludes1 note on E34.2 lists "ectopic ACTH syndrome (E24.3)". 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).
What is the ICD-9 equivalent of E34.2?
Under the General Equivalence Mappings, ectopic hormone secretion, not elsewhere classified converts to ICD-9-CM 259.3 (ectopic hormone secr NEC). The mapping is a direct match.
