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Dx

ICD-10-CM 2027

ICD-10 code for osteonecrosis

M87.9

Osteonecrosis, unspecified

✓ Billable / specificCC — complication/comorbidity

From the official ICD-10-CM alphabetic index entry “Osteonecrosis”. Page updated September 29, 2026.

About coding osteonecrosis

The ICD-10-CM code for osteonecrosis is M87.9 (Osteonecrosis, unspecified). The official index lists 163 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M87.9.

Within M87, choose M87.9 (unspecified) only when documentation doesn't support a more specific option: idiopathic aseptic necrosis of bone (M87.0), due to drugs (M87.1), due to previous trauma (M87.2), other secondary osteonecrosis (M87.3) and other osteonecrosis (M87.8).

Use an additional code to identify major osseous defect, if applicable (M89.7-).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

More specific osteonecrosis codes (official index)

  • due to
  • drugs
  • trauma
  • idiopathic aseptic M87.00 — Idiopathic aseptic necrosis of unspecified bone
  • ankle M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
  • carpus M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
  • clavicle M87.01 — Idiopathic aseptic necrosis of shoulder
  • femur M87.05 — Idiopathic aseptic necrosis of pelvis and femur
  • fibula M87.06 — Idiopathic aseptic necrosis of tibia and fibula
  • finger M87.04 — Idiopathic aseptic necrosis of hand and fingers
  • humerus M87.02 — Idiopathic aseptic necrosis of humerus
  • ilium M87.050 — Idiopathic aseptic necrosis of pelvis
  • ischium M87.050 — Idiopathic aseptic necrosis of pelvis
  • metacarpus M87.04 — Idiopathic aseptic necrosis of hand and fingers
  • metatarsus M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
  • multiple sites M87.09 — Idiopathic aseptic necrosis of bone, multiple sites
  • neck M87.08 — Idiopathic aseptic necrosis of bone, other site
  • pelvis M87.050 — Idiopathic aseptic necrosis of pelvis
  • pubic ramus [pubis] M87.050 — Idiopathic aseptic necrosis of pelvis
  • radius M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
  • rib M87.08 — Idiopathic aseptic necrosis of bone, other site
  • scapula M87.01 — Idiopathic aseptic necrosis of shoulder
  • skull M87.08 — Idiopathic aseptic necrosis of bone, other site
  • tarsus M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
  • tibia M87.06 — Idiopathic aseptic necrosis of tibia and fibula
  • toe M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
  • ulna M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
  • vertebra M87.08 — Idiopathic aseptic necrosis of bone, other site
  • secondary NEC M87.30 — Other secondary osteonecrosis, unspecified bone
  • carpus M87.33 — Other secondary osteonecrosis of radius, ulna and carpus
  • clavicle M87.31 — Other secondary osteonecrosis, shoulder
  • due to
  • drugs M87.10 — Osteonecrosis due to drugs, unspecified bone
  • carpus M87.13 — Osteonecrosis due to drugs of radius, ulna and carpus
  • clavicle M87.11 — Osteonecrosis due to drugs, shoulder
  • femur M87.15 — Osteonecrosis due to drugs, pelvis and femur
  • fibula M87.16 — Osteonecrosis due to drugs, tibia and fibula
  • finger M87.14 — Osteonecrosis due to drugs, hand and fingers
  • humerus M87.12 — Osteonecrosis due to drugs, humerus
  • ilium M87.150 — Osteonecrosis due to drugs, pelvis
  • ischium M87.150 — Osteonecrosis due to drugs, pelvis
  • jaw M87.180 — Osteonecrosis due to drugs, jaw
  • metacarpus M87.14 — Osteonecrosis due to drugs, hand and fingers
  • metatarsus M87.17 — Osteonecrosis due to drugs, ankle, foot and toes
  • multiple sites M87.19 — Osteonecrosis due to drugs, multiple sites
  • neck M87.188 — Osteonecrosis due to drugs, other site
  • pubic ramus [pubis] M87.150 — Osteonecrosis due to drugs, pelvis
  • radius M87.13 — Osteonecrosis due to drugs of radius, ulna and carpus
  • rib M87.188 — Osteonecrosis due to drugs, other site
  • scapula M87.11 — Osteonecrosis due to drugs, shoulder
  • skull M87.188 — Osteonecrosis due to drugs, other site
  • tarsus M87.17 — Osteonecrosis due to drugs, ankle, foot and toes
  • tibia M87.16 — Osteonecrosis due to drugs, tibia and fibula
  • toe M87.17 — Osteonecrosis due to drugs, ankle, foot and toes
  • ulna M87.13 — Osteonecrosis due to drugs of radius, ulna and carpus
  • vertebra M87.188 — Osteonecrosis due to drugs, other site
  • hemoglobinopathy NEC D58.2 — Other hemoglobinopathies
  • carpus D58.2 — Other hemoglobinopathies
  • clavicle D58.2 — Other hemoglobinopathies
  • femur D58.2 — Other hemoglobinopathies
  • fibula D58.2 — Other hemoglobinopathies
  • finger D58.2 — Other hemoglobinopathies
  • humerus D58.2 — Other hemoglobinopathies
  • ilium D58.2 — Other hemoglobinopathies
  • ischium D58.2 — Other hemoglobinopathies
  • metacarpus D58.2 — Other hemoglobinopathies
  • metatarsus D58.2 — Other hemoglobinopathies
  • multiple sites D58.2 — Other hemoglobinopathies
  • neck D58.2 — Other hemoglobinopathies
  • pubic ramus
  • radius D58.2 — Other hemoglobinopathies
  • rib D58.2 — Other hemoglobinopathies
  • scapula D58.2 — Other hemoglobinopathies
  • skull D58.2 — Other hemoglobinopathies
  • specified NEC D58.2 — Other hemoglobinopathies
  • tarsus D58.2 — Other hemoglobinopathies
  • tibia D58.2 — Other hemoglobinopathies
  • toe D58.2 — Other hemoglobinopathies
  • ulna D58.2 — Other hemoglobinopathies
  • vertebra D58.2 — Other hemoglobinopathies
  • trauma (previous) M87.20 — Osteonecrosis due to previous trauma, unspecified bone
  • carpus M87.23 — Osteonecrosis due to previous trauma of radius, ulna and carpus
  • clavicle M87.21 — Osteonecrosis due to previous trauma, shoulder
  • femur M87.25 — Osteonecrosis due to previous trauma, pelvis and femur
  • fibula M87.26 — Osteonecrosis due to previous trauma, tibia and fibula
  • finger M87.24 — Osteonecrosis due to previous trauma, hand and fingers
  • humerus M87.22 — Osteonecrosis due to previous trauma, humerus
  • ilium M87.250 — Osteonecrosis due to previous trauma, pelvis
  • ischium M87.250 — Osteonecrosis due to previous trauma, pelvis
  • metacarpus M87.24 — Osteonecrosis due to previous trauma, hand and fingers
  • metatarsus M87.27 — Osteonecrosis due to previous trauma, ankle, foot and toes
  • multiple sites M87.29 — Osteonecrosis due to previous trauma, multiple sites
  • neck M87.28 — Osteonecrosis due to previous trauma, other site
  • pubic ramus [pubis] M87.250 — Osteonecrosis due to previous trauma, pelvis
  • radius M87.23 — Osteonecrosis due to previous trauma of radius, ulna and carpus
  • rib M87.28 — Osteonecrosis due to previous trauma, other site
  • scapula M87.21 — Osteonecrosis due to previous trauma, shoulder
  • skull M87.28 — Osteonecrosis due to previous trauma, other site
  • tarsus M87.27 — Osteonecrosis due to previous trauma, ankle, foot and toes
  • tibia M87.26 — Osteonecrosis due to previous trauma, tibia and fibula
  • toe M87.27 — Osteonecrosis due to previous trauma, ankle, foot and toes
  • ulna M87.23 — Osteonecrosis due to previous trauma of radius, ulna and carpus
  • vertebra M87.28 — Osteonecrosis due to previous trauma, other site
  • femur M87.35 — Other secondary osteonecrosis, pelvis and femur
  • fibula M87.36 — Other secondary osteonecrosis, tibia and fibula
  • finger M87.34 — Other secondary osteonecrosis, hand and fingers
  • humerus M87.32 — Other secondary osteonecrosis, humerus
  • ilium M87.350 — Other secondary osteonecrosis, pelvis
  • in
  • caisson disease T70.3 — Caisson disease [decompression sickness]
  • carpus T70.3 — Caisson disease [decompression sickness]
  • clavicle T70.3 — Caisson disease [decompression sickness]
  • femur T70.3 — Caisson disease [decompression sickness]
  • fibula T70.3 — Caisson disease [decompression sickness]
  • finger T70.3 — Caisson disease [decompression sickness]
  • humerus T70.3 — Caisson disease [decompression sickness]
  • ilium T70.3 — Caisson disease [decompression sickness]
  • ischium T70.3 — Caisson disease [decompression sickness]
  • metacarpus T70.3 — Caisson disease [decompression sickness]
  • metatarsus T70.3 — Caisson disease [decompression sickness]
  • multiple sites T70.3 — Caisson disease [decompression sickness]
  • neck T70.3 — Caisson disease [decompression sickness]
  • pubic ramus
  • radius T70.3 — Caisson disease [decompression sickness]
  • rib T70.3 — Caisson disease [decompression sickness]
  • scapula T70.3 — Caisson disease [decompression sickness]
  • skull T70.3 — Caisson disease [decompression sickness]
  • tarsus T70.3 — Caisson disease [decompression sickness]
  • tibia T70.3 — Caisson disease [decompression sickness]
  • toe T70.3 — Caisson disease [decompression sickness]
  • ulna T70.3 — Caisson disease [decompression sickness]
  • vertebra T70.3 — Caisson disease [decompression sickness]
  • ischium M87.350 — Other secondary osteonecrosis, pelvis
  • metacarpus M87.34 — Other secondary osteonecrosis, hand and fingers
  • metatarsus M87.37 — Other secondary osteonecrosis, ankle and foot
  • multiple site M87.39 — Other secondary osteonecrosis, multiple sites
  • neck M87.38 — Other secondary osteonecrosis, other site
  • pubic ramus [pubis] M87.350 — Other secondary osteonecrosis, pelvis
  • radius M87.33 — Other secondary osteonecrosis of radius, ulna and carpus
  • rib M87.38 — Other secondary osteonecrosis, other site
  • scapula M87.319 — Other secondary osteonecrosis, unspecified shoulder
  • skull M87.38 — Other secondary osteonecrosis, other site
  • tarsus M87.379 — Other secondary osteonecrosis, unspecified toe(s)
  • tibia M87.366 — Other secondary osteonecrosis, unspecified fibula
  • toe M87.379 — Other secondary osteonecrosis, unspecified toe(s)
  • ulna M87.33 — Other secondary osteonecrosis of radius, ulna and carpus
  • vertebra M87.38 — Other secondary osteonecrosis, other site
  • specified type NEC M87.80 — Other osteonecrosis, unspecified bone
  • carpus M87.83 — Other osteonecrosis of radius, ulna and carpus
  • clavicle M87.81 — Other osteonecrosis, shoulder
  • femur M87.85 — Other osteonecrosis, pelvis and femur
  • fibula M87.86 — Other osteonecrosis, tibia and fibula
  • finger M87.84 — Other osteonecrosis, hand and fingers
  • humerus M87.82 — Other osteonecrosis, humerus
  • ilium M87.850 — Other osteonecrosis, pelvis
  • ischium M87.850 — Other osteonecrosis, pelvis
  • metacarpus M87.84 — Other osteonecrosis, hand and fingers
  • metatarsus M87.87 — Other osteonecrosis, ankle, foot and toes
  • multiple sites M87.89 — Other osteonecrosis, multiple sites
  • neck M87.88 — Other osteonecrosis, other site
  • pubic ramus [pubis] M87.850 — Other osteonecrosis, pelvis
  • radius M87.83 — Other osteonecrosis of radius, ulna and carpus
  • rib M87.88 — Other osteonecrosis, other site
  • scapula M87.81 — Other osteonecrosis, shoulder
  • skull M87.88 — Other osteonecrosis, other site
  • tarsus M87.87 — Other osteonecrosis, ankle, foot and toes
  • tibia M87.86 — Other osteonecrosis, tibia and fibula
  • toe M87.87 — Other osteonecrosis, ankle, foot and toes
  • ulna M87.83 — Other osteonecrosis of radius, ulna and carpus
  • vertebra M87.88 — Other osteonecrosis, other site

Common questions about osteonecrosis ICD-10 codes

What is the ICD-10 code for osteonecrosis?

M87.9 — Osteonecrosis, unspecified. More specific codes apply when the documentation supports them: M87.00, M87.07, M87.03, M87.01 and others below.

What is the ICD-10 code for idiopathic aseptic osteonecrosis?

M87.00 — Idiopathic aseptic necrosis of unspecified bone.

What is the ICD-10 code for secondary nec osteonecrosis?

M87.30 — Other secondary osteonecrosis, unspecified bone.

Is M87.9 billable?

Yes. M87.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M87.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M87.9 as a principal diagnosis.

Is M87.9 a CC or MCC?

M87.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.