Chapters and the most searched codes
The 22 chapters of the tabular list, each with its billable code count and the codes in it that people search for most.
Chapter 1: Certain infectious and parasitic diseases (A00-B99)
1,068 billable codes in 22 sections
Chapter 2: Neoplasms (C00-D49)
1,730 billable codes in 23 sections
- C15.5 Malignant neoplasm of lower third of esophagus
- C16.0 Malignant neoplasm of cardia
- C18.2 Malignant neoplasm of ascending colon
- C18.7 Malignant neoplasm of sigmoid colon
- C18.9 Malignant neoplasm of colon, unspecified
- C19 Malignant neoplasm of rectosigmoid junction
- C20 Malignant neoplasm of rectum
- C22.0 Liver cell carcinoma
- C22.1 Intrahepatic bile duct carcinoma
- C23 Malignant neoplasm of gallbladder
- C25.9 Malignant neoplasm of pancreas, unspecified
- C34.11 Malignant neoplasm of upper lobe, right bronchus or lung
- C34.90 Malignant neoplasm of unspecified part of unspecified bronchus or lung
- C49.9 Malignant neoplasm of connective and soft tissue, unspecified
- C56.9 Malignant neoplasm of unspecified ovary
- C64.1 Malignant neoplasm of right kidney, except renal pelvis
- C71.9 Malignant neoplasm of brain, unspecified
- C77.0 Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
- C77.3 Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
- C77.9 Secondary and unspecified malignant neoplasm of lymph node, unspecified
- C78.00 Secondary malignant neoplasm of unspecified lung
- C78.6 Secondary malignant neoplasm of retroperitoneum and peritoneum
- C78.7 Secondary malignant neoplasm of liver and intrahepatic bile duct
- C79.31 Secondary malignant neoplasm of brain
- C79.51 Secondary malignant neoplasm of bone
- C79.89 Secondary malignant neoplasm of other specified sites
- C79.9 Secondary malignant neoplasm of unspecified site
- C7A.8 Other malignant neuroendocrine tumors
- C83.30 Diffuse large B-cell lymphoma, unspecified site
- C85.90 Non-Hodgkin lymphoma, unspecified, unspecified site
- C90.00 Multiple myeloma not having achieved remission
- C91.10 Chronic lymphocytic leukemia of B-cell type not having achieved remission
- C92.00 Acute myeloblastic leukemia, not having achieved remission
- C92.10 Chronic myeloid leukemia, BCR/ABL-positive, not having achieved remission
- D47.1 Chronic myeloproliferative disease
Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
324 billable codes in 7 sections
Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E89)
973 billable codes in 10 sections
- E10.65 Type 1 diabetes mellitus with hyperglycemia
- E10.9 Type 1 diabetes mellitus without complications
- E11.10 Type 2 diabetes mellitus with ketoacidosis without coma
- E11.52 Type 2 diabetes mellitus with diabetic peripheral angiopathy with gangrene
- E11.9 Type 2 diabetes mellitus without complications
- E13.9 Other specified diabetes mellitus without complications
- E66.2 Morbid (severe) obesity with alveolar hypoventilation
- E85.4 Organ-limited amyloidosis
Chapter 5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
872 billable codes in 11 sections
- F01.50 Vascular dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- F02.80 Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- F02.818 Dementia in other diseases classified elsewhere, unspecified severity, with other behavioral disturbance
- F03.90 Unspecified dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- F03.918 Unspecified dementia, unspecified severity, with other behavioral disturbance
- F05 Delirium due to known physiological condition
- F10.239 Alcohol dependence with withdrawal, unspecified
- F11.20 Opioid dependence, uncomplicated
- F13.20 Sedative, hypnotic or anxiolytic dependence, uncomplicated
- F15.20 Other stimulant dependence, uncomplicated
- F20.0 Paranoid schizophrenia
- F23 Brief psychotic disorder
- F31.2 Bipolar disorder, current episode manic severe with psychotic features
- F31.4 Bipolar disorder, current episode depressed, severe, without psychotic features
- F31.81 Bipolar II disorder
- F32.1 Major depressive disorder, single episode, moderate
- F32.3 Major depressive disorder, single episode, severe with psychotic features
- F33.1 Major depressive disorder, recurrent, moderate
- F33.3 Major depressive disorder, recurrent, severe with psychotic symptoms
Chapter 6: Diseases of the nervous system (G00-G99)
700 billable codes in 11 sections
- G10 Huntington's disease
- G12.21 Amyotrophic lateral sclerosis
- G30.1 Alzheimer's disease with late onset
- G40.209 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus
- G40.89 Other seizures
- G61.81 Chronic inflammatory demyelinating polyneuritis
- G80.0 Spastic quadriplegic cerebral palsy
- G81.94 Hemiplegia, unspecified affecting left nondominant side
- G82.20 Paraplegia, unspecified
- G82.50 Quadriplegia, unspecified
- G95.9 Disease of spinal cord, unspecified
Chapter 7: Diseases of the eye and adnexa (H00-H59)
2,677 billable codes in 12 sections
- H35.3211 Exudative age-related macular degeneration, right eye, with active choroidal neovascularization
Chapter 8: Diseases of the ear and mastoid process (H60-H95)
653 billable codes in 5 sections
Chapter 9: Diseases of the circulatory system (I00-I99)
1,433 billable codes in 10 sections
- I12.0 Hypertensive chronic kidney disease with stage 5 chronic kidney disease or end stage renal disease
- I13.0 Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
- I13.2 Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease
- I21.3 ST elevation (STEMI) myocardial infarction of unspecified site
- I21.4 Non-ST elevation (NSTEMI) myocardial infarction
- I21.9 Acute myocardial infarction, unspecified
- I25.110 Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
- I26.99 Other pulmonary embolism without acute cor pulmonale
- I42.9 Cardiomyopathy, unspecified
- I43 Cardiomyopathy in diseases classified elsewhere
- I44.2 Atrioventricular block, complete
- I46.9 Cardiac arrest, cause unspecified
- I47.20 Ventricular tachycardia, unspecified
- I48.19 Other persistent atrial fibrillation
- I48.20 Chronic atrial fibrillation, unspecified
- I50.1 Left ventricular failure, unspecified
- I50.21 Acute systolic (congestive) heart failure
- I50.32 Chronic diastolic (congestive) heart failure
- I50.33 Acute on chronic diastolic (congestive) heart failure
- I60.9 Nontraumatic subarachnoid hemorrhage, unspecified
- I61.9 Nontraumatic intracerebral hemorrhage, unspecified
- I63.81 Other cerebral infarction due to occlusion or stenosis of small artery
- I63.9 Cerebral infarction, unspecified
- I69.351 Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side
- I70.223 Atherosclerosis of native arteries of extremities with rest pain, bilateral legs
- I82.409 Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity
- I96 Gangrene, not elsewhere classified
Chapter 10: Diseases of the respiratory system (J00-J99)
366 billable codes in 11 sections
- J44.0 Chronic obstructive pulmonary disease with (acute) lower respiratory infection
- J44.1 Chronic obstructive pulmonary disease with (acute) exacerbation
- J69.0 Pneumonitis due to inhalation of food and vomit
- J80 Acute respiratory distress syndrome
- J84.9 Interstitial pulmonary disease, unspecified
- J96.01 Acute respiratory failure with hypoxia
- J96.11 Chronic respiratory failure with hypoxia
- J99 Respiratory disorders in diseases classified elsewhere
Chapter 11: Diseases of the digestive system (K00-K95)
863 billable codes in 10 sections
- K50.00 Crohn's disease of small intestine without complications
- K50.90 Crohn's disease, unspecified, without complications
- K51.00 Ulcerative (chronic) pancolitis without complications
- K51.90 Ulcerative colitis, unspecified, without complications
- K56.609 Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction
- K65.1 Peritoneal abscess
- K70.30 Alcoholic cirrhosis of liver without ascites
Chapter 12: Diseases of the skin and subcutaneous tissue (L00-L99)
1,001 billable codes in 9 sections
Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
6,687 billable codes in 24 sections
Chapter 14: Diseases of the genitourinary system (N00-N99)
838 billable codes in 11 sections
Chapter 15: Pregnancy, childbirth and the puerperium (O00-O9A)
2,481 billable codes in 9 sections
Chapter 16: Certain conditions originating in the perinatal period (P00-P96)
463 billable codes in 12 sections
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
900 billable codes in 12 sections
- Q21.12 Patent foramen ovale
Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
774 billable codes in 14 sections
Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88)
41,187 billable codes in 24 sections
Chapter 20: External causes of morbidity (V00-Y99)
7,461 billable codes in 34 sections
Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)
1,425 billable codes in 15 sections
- Z01.812 Encounter for preprocedural laboratory examination
- Z01.818 Encounter for other preprocedural examination
- Z01.89 Encounter for other specified special examinations
- Z08 Encounter for follow-up examination after completed treatment for malignant neoplasm
- Z09 Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm
- Z11.3 Encounter for screening for infections with a predominantly sexual mode of transmission
- Z12.11 Encounter for screening for malignant neoplasm of colon
- Z12.31 Encounter for screening mammogram for malignant neoplasm of breast
- Z13.6 Encounter for screening for cardiovascular disorders
- Z15.01 Genetic susceptibility to malignant neoplasm of breast
- Z17.0 Estrogen receptor positive status [ER+]
- Z21 Asymptomatic human immunodeficiency virus [HIV] infection status
- Z23 Encounter for immunization
- Z34.90 Encounter for supervision of normal pregnancy, unspecified, unspecified trimester
- Z42.1 Encounter for breast reconstruction following mastectomy
- Z43.1 Encounter for attention to gastrostomy
- Z51.89 Encounter for other specified aftercare
- Z68.30 Body mass index [BMI] 30.0-30.9, adult
- Z68.41 Body mass index [BMI] 40.0-44.9, adult
- Z72.51 High risk heterosexual behavior
- Z78.0 Asymptomatic menopausal state
- Z79.4 Long term (current) use of insulin
- Z79.84 Long term (current) use of oral hypoglycemic drugs
- Z79.890 Hormone replacement therapy
- Z80.3 Family history of malignant neoplasm of breast
- Z82.49 Family history of ischemic heart disease and other diseases of the circulatory system
- Z85.3 Personal history of malignant neoplasm of breast
- Z86.0100 Personal history of colon polyps, unspecified
- Z86.19 Personal history of other infectious and parasitic diseases
- Z86.69 Personal history of other diseases of the nervous system and sense organs
- Z86.73 Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficits
- Z86.79 Personal history of other diseases of the circulatory system
- Z87.19 Personal history of other diseases of the digestive system
- Z87.891 Personal history of nicotine dependence
- Z89.512 Acquired absence of left leg below knee
- Z90.3 Acquired absence of stomach [part of]
- Z90.49 Acquired absence of other specified parts of digestive tract
- Z90.710 Acquired absence of both cervix and uterus
- Z91.018 Allergy to other foods
- Z91.81 History of falling
- Z91.89 Other specified personal risk factors, not elsewhere classified
- Z92.3 Personal history of irradiation
- Z93.0 Tracheostomy status
- Z93.2 Ileostomy status
- Z93.3 Colostomy status
- Z94.0 Kidney transplant status
- Z95.0 Presence of cardiac pacemaker
- Z95.1 Presence of aortocoronary bypass graft
- Z95.2 Presence of prosthetic heart valve
- Z95.5 Presence of coronary angioplasty implant and graft
- Z95.810 Presence of automatic (implantable) cardiac defibrillator
- Z95.828 Presence of other vascular implants and grafts
- Z98.84 Bariatric surgery status
- Z98.890 Other specified postprocedural states
- Z99.11 Dependence on respirator [ventilator] status
- Z99.2 Dependence on renal dialysis
- Z99.3 Dependence on wheelchair
- Z99.81 Dependence on supplemental oxygen
Chapter 22: Codes for special purposes (U00-U85)
3 billable codes in 1 sections
ICD-10 codes for common conditions
The Index to Diseases entry for each condition, with its default code and the codes that more specific documentation leads to.
- ICD-10 code for HypertensionI10
- ICD-10 code for HeadacheR51.9
- ICD-10 code for Shortness of breathR06.02
- ICD-10 code for HyperlipidemiaE78.5
- ICD-10 code for CoughR05.9
- ICD-10 code for Type 2 diabetesE11.9
- ICD-10 code for Urinary tract infection (UTI)N39.0
- ICD-10 code for Gastroesophageal reflux disease (GERD)K21.9
- ICD-10 code for HypothyroidismE03.9
- ICD-10 code for Abdominal painR10.9
- ICD-10 code for Atrial fibrillationI48.91
- ICD-10 code for Coronary artery disease (CAD)I25.10
- ICD-10 code for Attention-deficit hyperactivity disorder (ADHD)F90.9
- ICD-10 code for DepressionF32.A
- ICD-10 code for ObesityE66.9
- ICD-10 code for AnxietyF41.9
- ICD-10 code for Chronic obstructive pulmonary disease (COPD)J44.9
- ICD-10 code for AsthmaJ45.909
- ICD-10 code for HypokalemiaE87.6
- ICD-10 code for InsomniaG47.00
- ICD-10 code for FatigueR53.83
- ICD-10 code for Vitamin D deficiencyE55.9
- ICD-10 code for DizzinessR42
- ICD-10 code for Congestive heart failure (CHF)I50.9
- ICD-10 code for PneumoniaJ18.9
- ICD-10 code for PrediabetesR73.03
Diagnosis code tools
- The HCC and RAF calculator maps codes to CMS-HCC V28 categories and estimates a risk score.
- The CC and MCC list checks a secondary code against a principal diagnosis.
- The MS-DRG lookup shows where a principal diagnosis groups.
- The Medicare Code Editor lists flag age, sex and manifestation conflicts.
- The FY2027 ICD-10 code changes report lists every new code with its CC level.
How the code pages are built
The descriptors and the instructional notes (inclusion terms, Excludes1 and Excludes2, code first, use additional code, code also and 7th-character definitions) come from the FY2027 tabular list. The payment facts come from the MS-DRG v44 definitions and CC/MCC table, the FY2027 POA exempt list and the PY2027 CMS-HCC V28 mapping, and the coverage facts from the current billing and coding articles in the Medicare Coverage Database. 200 code pages are offered to search engines now: codes with at least 50 monthly US searches for “code icd 10” and at least 3 of those data joins. Another 81 codes qualify and are added in reviewed batches; the reference methodology explains the review.
For teams evaluating QuickIntell software
Evaluate software for diagnosis coding review
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Frequently asked questions
How many ICD-10-CM codes are there for FY2027?
The FY2027 ICD-10-CM code set, effective October 1, 2026, has 74,879 billable codes. Category headings and subcategories that need more characters cannot be billed; a code is billable only when it has all its characters, including a 7th character where the tabular list requires one.
What changed in ICD-10-CM for FY2027?
CMS and NCHS added 238 codes or headings and revised some descriptions for FY2027. The FY2027 ICD-10 code changes report lists each new diagnosis code with its CC level and MS-DRG links.
Why are only some code pages in search results?
Every billable code has a page, but a code page is offered to search engines only when people search for that code and the page carries data beyond the descriptor: an HCC, CC/MCC, hospital-acquired condition, code editor, present-on-admission or LCD listing, or an FY2027 change. The rest stay available as noindex reference pages.
Sources
Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.
- ICD-10-CM FY2027 tabular order file (category titles)Version FY2027 · effective 2026-10-01 · file icd10cm_order_2027.txtSHA-256 38981fb2c1226e2b…
- ICD-10-CM FY2027 tabular list (chapter titles and ranges)Version FY2027 · effective 2026-10-01 · file 2027-code-tables-tabular-index.zipSHA-256 37baa476323714be…
- ICD-10-CM FY2027 code descriptions addenda (codes added, deleted and revised)Version FY2027 · effective 2026-10-01 · file icd10cm_codes_addenda_2027.txtSHA-256 cfba025073235af4…
- ICD-10 MS-DRG Definitions Manual v44 (text)Version v44 · effective 2026-10-01 · file fy2027-fr-icd10-ms-drg-definitions-manual-files-v44.zipSHA-256 ae4f6c11727fe91f…
- ICD-10-CM to CMS-HCC V28 mappings, payment year 2027 initialVersion PY2027 initial ICD-10-CM mappings (dates of service 2026) · effective 2027-01-01 · file 2027 Initial ICD-10-CM Mappings.csvSHA-256 9c260b06d0dd2806…
Disclaimer
Code descriptors and notes are reproduced from the FY2027 ICD-10-CM files. Code from the medical record and the ICD-10-CM Official Guidelines for Coding and Reporting. Not legal, clinical or billing advice.
Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.