DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

E21 Hyperparathyroidism and other disorders of parathyroid gland

  • Header · not billable

E21 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

  • Hyperparathyroidism → E21.3
  • Osteitisparathyroid → E21.0
  • Dysfunctionparathyroid → E21.4

Where it sits

  1. Chapter 4 Endocrine, nutritional and metabolic diseases (E00-E89)
  2. E20-E35 Disorders of other endocrine glands (E20-E35)
  3. E21 Hyperparathyroidism and other disorders of parathyroid gland
Billable codes
6
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
29

Codes in E21

  1. E21.0
    Primary hyperparathyroidism
    Billable
    Inclusion terms 2

    Inclusion terms

    • Hyperplasia of parathyroid
    • Osteitis fibrosa cystica generalisata [von Recklinghausen's disease of bone]
  2. E21.1
    Secondary hyperparathyroidism, not elsewhere classified
    Billable
    Excludes1 1

    Excludes1

    • secondary hyperparathyroidism of renal origin (N25.81) N25.81
  3. E21.2
    Other hyperparathyroidism
    Billable
    Inclusion terms 1, Excludes2 1

    Inclusion terms

    • Tertiary hyperparathyroidism

    Excludes2

    • familial hypocalciuric hypercalcemia (E83.52) E83.52
  4. E21.3
    Hyperparathyroidism, unspecified
    Billable
  5. E21.4
    Other specified disorders of parathyroid gland
    Billable
  6. E21.5
    Disorder of parathyroid gland, unspecified
    Billable

Sources of each column.

Instructions

At E21

Excludes1

  • adult osteomalacia (M83.-) M83
  • ectopic hyperparathyroidism (E34.2) E34.2
  • hungry bone syndrome (E83.81) E83.81
  • infantile and juvenile osteomalacia (E55.0) E55.0

Excludes2

  • familial hypocalciuric hypercalcemia (E83.52) E83.52

Notes that also apply

Block E20-E35 instructions (Excludes1 2): printed on the block page.

Chapter 4 instructions (Notes 1, Excludes1 1): printed on the chapter 4 page.

Index entries

  • Hyperparathyroidism → E21.3
  • Disease, diseasedosteofibrocystic → E21.0
  • Enlargement, enlargedparathyroid (gland) → E21.0
  • Hyperparathyroidismprimary → E21.0
  • Hyperplasia, hyperplasticparathyroid (gland) → E21.0
  • Hypertrophy, hypertrophicparathyroid (gland) → E21.0
  • Osteitisparathyroid → E21.0
  • Recklinghausen diseasebones → E21.0
  • Osteodystrophyparathyroid, secondary → E21.1
  • Hyperparathyroidismspecified NEC → E21.2
  • Hyperparathyroidismtertiary → E21.2
  • Hyperfunctionparathyroid (gland) → E21.3
  • Cyst (colloid) (mucous) (simple) (retention)parathyroid (gland) → E21.4
  • Displacement, displacedparathyroid (gland) → E21.4
  • Dysfunctionparathyroid → E21.4
  • Hemorrhage, hemorrhagic (concealed)parathyroid (gland) (spontaneous) → E21.4
  • Infarct, infarctionparathyroid gland → E21.4
  • Disease, diseasedparathyroid (gland) → E21.5
  • Disorder (of)parathyroid (gland) → E21.5
  • Osteitisfibrosa NECcystica (generalisata) → E21.0
  • Osteitisfibrosa NECosteoplastica → E21.0
  • Von Recklinghausendisease (neurofibromatosis)bones → E21.0
  • Hyperparathyroidismsecondary (renal)non-renal → E21.1
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)in (due to)hyperparathyroidism NEC → E21.3
  • Myopathyin (due to)hyperparathyroidism NEC → E21.3 [G73.7]
  • Disease, diseasedparathyroid (gland)specified NEC → E21.4
  • Disorder (of)parathyroid (gland)specified NEC → E21.4
  • Arthropathyhemophilic NECin (due to)hyperparathyroidism NEC → E21.3 [M14.8-]
  • Curvaturespine (acquired) (angular) (idiopathic) (incorrect) (postural)due to or associated withosteitisfibrosa cystica → E21.0

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy