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v1.0.0
ICD-10 Guide
DiagnosesParathyroid

Parathyroid

ICD-10 Coding for Parathyroid Disorders(E21.0)

PRIMARY SPECIALTYEndocrine Surgery
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Parathyroid?
Essential facts and insights about Parathyroid Disorders

Key Clinical Considerations:

  • Hypercalcemia, fatigue, weakness, bone pain
  • Serum calcium and parathyroid hormone (PTH) levels, imaging studies (ultrasound, Sestamibi scan)
  • Palpable neck mass, signs of osteoporosis, renal calculi

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, physical exam findings, lab results, imaging reports
  • ICD-10-CM codes for parathyroid disorders, CPT codes for surgical procedures
  • Examples: 'Patient presents with elevated calcium levels and PTH; ultrasound shows enlarged parathyroid gland.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for distinguishing between primary and secondary hyperparathyroidism.
  • Common errors include misclassifying the type of hyperparathyroidism.

Code Exclusions

Important Exclusions

  • Hypoparathyroidism, parathyroid carcinoma
  • Alternative codes for related endocrine disorders

Related ICD-10 Codes

Primary Codes
E21.0
Primary hyperparathyroidism
E21.1
Secondary hyperparathyroidism
E21.9
Parathyroid disorder, unspecified
Ancillary Codes
N20.0
Differential Codes
E21.1
E21.2

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Endocrine Surgery

Specialty Applications

  • Patients with hypercalcemia, osteoporosis, or renal stones
  • Endocrine surgery clinics, outpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include lab results, imaging studies, and clinical findings.

Billing considerations?

Ensure accurate coding of diagnosis and procedures to avoid denials.