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The clinical concepts for internal medicine guide includes common ICD-10 codes, clinical documentation tips and clinical scenarios.

Common ICD-10 Internal Medicine Codes

  • Abdominal Pain
  • Acute Respiratory Infections
  • Back and Neck Pain (Selected)
  • Chest Pain
  • Diabetes Mellitus w/o Complications Type 2
  • General Medical Examination
  • Headache
  • Hypertension
  • Pain in Joint
  • Pain in Limb
  • Other Forms of Heart Disease
  • Urinary Tract Infection, Cystitis

Abdominal Pain

(ICD-9-CM 789.00 to 789.09 range)

R10.0 Acute abdomen
R10.10 Upper abdominal pain, unspecified
R10.11 Right upper quadrant pain
R10.12 Left upper quadrant pain
R10.13 Epigastric pain
R10.2 Pelvic and perineal pain
R10.30 Lower abdominal pain
R10.31 Right lower quadrant pain
R10.32 Left lower quadrant pain
R10.33 Periumbilical pain
R10.84 Generalized abdominal pain
R10.9* Unspecified abdominal pain

Back and Neck Pain (Selected)

(ICD-9-CM 723.1, 724.1, 724.2, 724.5)

M54.2 Cervicalgia
M54.5 Low back pain
M54.6 Pain in thoracic spine
M54.89 Other dorsalgia
M54.9* Dorsalgia, unspecified

Acute Respiratory Infections

(ICD-9-CM 462, 465.9, 466.0)
[Note: Organisms should be specified where possible]

J02.8 Acute pharyngitis due to other specified organisms
J02.9* Acute pharyngitis, unspecified
J06.9* Acute upper respiratory infection, unspecified
J20.0 Acute bronchitis due to Mycoplasma pneumoniae
J20.1 Acute bronchitis due to Hemophilus influenzae
J20.2 Acute bronchitis due to streptococcus
J20.3 Acute bronchitis due to coxsackievirus
J20.4 Acute bronchitis due to parainfluenza virus
J20.5 Acute bronchitis due to respiratory syncytial virus
J20.6 Acute bronchitis due to rhinovirus
J20.7 Acute bronchitis due to echovirus
J20.8 Acute bronchitis due to other specified organisms
J20.9* Acute bronchitis, unspecified

Chest Pain

(ICD-9-CM 786.50 to 786.59 range)

R07.1 Chest pain on breathing
R07.2 Precordial pain
R07.81 Pleurodynia
R07.82 Intercostal pain
R07.89 Other chest pain
R07.9* Chest pain, unspecified

Diabetes Mellitus w/o Complications Type 2

(ICD-9-CM 250.00)

E11.9 Type 2 diabetes mellitus without complications


(ICD-9-CM 784.0)

R51 Headache


(ICD-9-CM 401.9)

I10 Essential (primary) hypertension

General Medical Examination

(ICD-9-CM V70.0)

Z00.00 Encounter for general adult medical exam without abnormal findings
Z00.01 Encounter for general adult medical exam with abnormal findings

Pain in Joint

(ICD-9-CM 719.40 to 719.49 range)

M25.511 Pain in right shoulder
M25.512 Pain in left shoulder
M25.519* Pain in unspecified shoulder
M25.521 Pain in right elbow
M25.522 Pain in left elbow
M25.529* Pain in unspecified elbow
M25.531 Pain in right wrist
M25.532 Pain in left wrist
M25.539* Pain in unspecified wrist
M25.551 Pain in right hip
M25.552 Pain in left hip
M25.559* Pain in unspecified hip
M25.561 Pain in right knee
M25.562 Pain in left knee
M25.569* Pain in unspecified knee
M25.571 Pain in right ankle and joints of right foot
M25.572 Pain in left ankle and joints of left foot
M25.579* Pain in unspecified ankle and joints of unspecified foot
M25.50* Pain in unspecified joint
M79.601 Pain in right arm
M79.602 Pain in left arm
M79.603* Pain in arm, unspecified
M79.604 Pain in right leg
M79.605 Pain in left leg
M79.606* Pain in leg, unspecified

Pain in Limb

(ICD-9-CM 729.5)

M79.609 Pain in unspecified limb
M79.621 Pain in right upper arm
M79.622 Pain in left upper arm
M79.629* Pain in unspecified upper arm
M79.631 Pain in right forearm
M79.632 Pain in left forearm
M79.639* Pain in unspecified forearm
M79.641 Pain in right hand
M79.642 Pain in left hand
M79.643* Pain in unspecified hand
M79.644 Pain in right finger(s)
M79.645 Pain in left finger(s)
M79.646* Pain in unspecified finger(s)
M79.651 Pain in right thigh
M79.652 Pain in left thigh
M79.659* Pain in unspecified thigh
M79.661 Pain in right lower leg
M79.662 Pain in left lower leg
M79.669* Pain in unspecified lower leg
M79.671 Pain in right foot
M79.672 Pain in left foot
M79.673* Pain in unspecified foot
M79.674 Pain in right toe(s)
M79.675 Pain in left toe(s)
M79.676* Pain in unspecified toe(s)

Other Forms Of Heart Disease

(ICD-9-CM 427.31)

I48.0 Paroxysmal atrial fibrillation
I48.2 Chronic atrial fibrillation
I48.91* Unspecified atrial fibrillation
N30.00 Acute cystitis without hematuria
N30.01 Acute cystitis with hematuria
N30.10 Interstitial cystitis (chronic) without hematuria
N30.11 Interstitial cystitis (chronic) with hematuria
N30.20 Other chronic cystitis without hematuria
N30.21 Other chronic cystitis with hematuria
N30.30 Trigonitis without hematuria
N30.31 Trigonitis with hematuria
N30.40 Irradiation cystitis without hematuria
N30.41 Irradiation cystitis with hematuria
N30.80 Other cystitis without hematuria
N30.81 Other cystitis with hematuria
N30.90 Cystitis, unspecified without hematuria
N30.91 Cystitis, unspecified with hematuria


(ICD-9-CM 595.0 TO 595.4 RANGE, 595.81, 595.82, 595.89, 595.9, 599.0)

N39.0* Urinary tract infection, site not specified

*Codes with a greater degree of specificity should be considered first.