E21.0
E21.0: Primary hyperparathyroidism
Billable / specific codeICD-10-CM
E21.0 is a billable, specific ICD-10-CM code for primary hyperparathyroidism. It is valid for submission on a claim.
Check E21.0 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Hyperplasia of parathyroid
- Osteitis fibrosa cystica generalisata [von Recklinghausen's disease of bone]
Excludes1 inherited from the categories above E21.0
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above E21.0
Not part of this code, but both may be coded when both are present.
Other codes that can never be billed with E21.0
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
E21.0 is named in 14 Medicare coverage policies: 14 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56416Billing and Coding: Assays for Vitamins and Metabolic Function
- A56798Billing and Coding: Vitamin D Assay Testing
- A56841Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed
- A57122Billing and Coding: Parathormone (Parathyroid Hormone)
Alphabetic index entries that lead here
- Disease, diseased›osteofibrocystic
- Enlargement, enlarged›parathyroid(gland)
- Hyperparathyroidism›primary
- Hyperplasia, hyperplastic›parathyroid(gland)
- Hypertrophy, hypertrophic›parathyroid(gland)
- Osteitis›parathyroid
- Recklinghausen disease›bones
- Osteitis›fibrosa NEC›cystica(generalisata)
- Osteitis›fibrosa NEC›osteoplastica
- Von Recklinghausen›disease›bones
- Curvature›spine›due to or associated with›osteitis›fibrosa cystica
Code history
Unchanged in every release from FY2024 to FY2027.