ICD-10-CM
- Babington's disease (familial hemorrhagic telangiectasia)
- Babinski's syndrome
- Bacilluria
- Backward reading (dyslexia)
- Bacterid, bacteride (pustular)
- Bacteriuria, bacteruria (asymptomatic)
- Baelz's disease (cheilitis glandularis apostematosa)
- Baerensprung's disease (eczema marginatum)
- Bagasse disease or pneumonitis
- Bagassosis
- Bakwin-Krida syndrome (metaphyseal dysplasia)
- Balancing side interference
- Balantidiasis, balantidiosis
- Bald tongue
- Balkan grippe
- Balo's disease (concentric sclerosis)
- Bancroft's filariasis
- Bandemia
- Bandl's ring (contraction), complicating delivery
- Bang's disease (brucella abortus)
- Bangkok hemorrhagic fever
- Bankruptcy (anxiety concerning)
- Banti's disease or syndrome (with cirrhosis) (with portal hypertension)
- Barlow's disease
- Barodontalgia
- Barosinusitis
- Barotitis
- Barraquer (-Simons) disease or syndrome (progressive lipodystrophy)
- Barré-Guillain disease or syndrome
- Barrel chest
- Barré-Liéou syndrome (posterior cervical sympathetic)
- Bársony (-Polgár) (-Teschendorf) syndrome (corkscrew esophagus)
- Barth syndrome
- Barton's fracture
- Bartter's syndrome
- Basan's (hidrotic) ectodermal dysplasia
- Bason's (hidrotic) ectodermal dysplasia
- Basophilia
- Basophilism (cortico-adrenal) (Cushing's) (pituitary)
- Bassen-Kornzweig disease or syndrome
- Bat ear
- Bathing cramp
- Bathophobia
- Batten-Steinert syndrome
- Battey Mycobacterium infection
- Battledore placenta
- Battle exhaustion
- Baumgarten-Cruveilhier cirrhosis, disease or syndrome
- Bauxite fibrosis (of lung)
- Bayle's disease (general paresis)
- Bazin's disease (primary) (tuberculous)
- Beaded hair (congenital)
- Béal conjunctivitis or syndrome
- Beard's disease (neurasthenia)
- Beck's syndrome (anterior spinal artery occlusion)
- Beckwith-Wiedemann syndrome
- Bed confinement status
- Bedridden
- Bed-sharing, infant
- Beer drinker's heart (disease)
- Bee sting (with allergic or anaphylactic shock)
- Behçet's disease or syndrome
- Beigel's disease or morbus (white piedra)
- Bejel
- Bence Jones albuminuria or proteinuria NEC
- Bends
- Benedikt's paralysis or syndrome
- Bennett's fracture (displaced)
- Bereavement (uncomplicated)
- Bergeron's disease (hysterical chorea)
- Berlin's disease or edema (traumatic)
- Berlock (berloque) dermatitis
- Bernard-Horner syndrome
- Bernard-Soulier disease or thrombopathia
- Bertielliasis
- Berylliosis (lung)
- Best's disease
- Bestiality
- Betalipoproteinemia, broad or floating
- Beta-mercaptolactate-cysteine disulfiduria
- Bianchi's syndrome
- Biedl-Bardet syndrome
- Bielschowsky (-Jansky) disease
- Biermer's (pernicious) anemia or disease
- Biett's disease
- Biforis uterus (suprasimplex)
- Bigeminal pulse
- Bigorexia
- Big spleen syndrome
- Bilirubinemia, familial nonhemolytic
- Bilirubinuria
- Biliuria
- Bilocular stomach
- Binswanger's disease
- Birthmark
- Birt-Hogg-Dube syndrome
- Bisalbuminemia
- Biskra's button
- Biting, cheek or lip
- Biventricular failure (heart)
- Björck (-Thorson) syndrome (malignant carcinoid)
- Blackfan-Diamond anemia or syndrome (congenital hypoplastic anemia)
- Blackhead
- Blackout
- Blepharoclonus
- Blepharopyorrhea, gonococcal
- Blighted ovum
- Bloating
- Bloch-Sulzberger disease or syndrome
- Blocq's disease
- Blood-forming organs, disease
- Bloom (-Machacek)(-Torre) syndrome
- Blount disease or osteochondrosis
- Blurring, visual
- Blushing (abnormal) (excessive)
- Bockhart's impetigo
- Bodechtel-Guttman disease (subacute sclerosing panencephalitis)
- Boder-Sedgwick syndrome (ataxia-telangiectasia)
- Boerhaave's syndrome (spontaneous esophageal rupture)
- Bonnier's syndrome
- Bonvale dam fever
- BOOP (bronchiolitis obliterans organized pneumonia)
- Borna disease
- Bornholm disease
- Boston exanthem
- Botalli, ductus (patent) (persistent)
- Bothriocephalus latus infestation
- Bouchard's nodes (with arthropathy)
- Bouffée délirante
- Bouillaud's disease or syndrome (rheumatic heart disease)
- Bourneville's disease
- Bouveret (-Hoffmann) syndrome (paroxysmal tachycardia)
- Boyd's dysentery
- Brachycardia
- Brachycephaly, non-deformational
- Bradley's disease
- Bradyarrhythmia, cardiac
- Bradykinesia
- Bradypnea
- Bradytachycardia
- Branched-chain amino-acid disorder
- Branchiogenic remnant (in neck)
- Brandt's syndrome (acrodermatitis enteropathica)
- Brash (water)
- Brazilian leishmaniasis
- BRBPR
- Breathlessness
- Breisky's disease
- Brennemann's syndrome
- Bretonneau's disease or angina
- Breus' mole
- Brevicollis
- Bridge, myocardial
- Bright red blood per rectum (BRBPR)
- Brill (-Zinsser) disease (recrudescent typhus)
- Brill-Symmers' disease
- Briquet's disorder or syndrome
- Broad- or floating-betalipoproteinemia
- Brock's syndrome (atelectasis due to enlarged lymph nodes)
- Brocq-Duhring disease (dermatitis herpetiformis)
- Brodie's abscess or disease
- Bromhidrosis, bromidrosis
- Bromidrosiphobia
- Bronchoalveolitis
- Bronchoaspergillosis
- Bronchocele meaning goiter
- Bronchorrhagia(see Hemoptysis)
- Bronchostenosis
- Brontophobia
- Bronze baby syndrome
- Brown's sheath syndrome
- Brown enamel of teeth (hereditary)
- Brown-Séquard disease, paralysis or syndrome
- Bruce sepsis
- Bruck-de Lange disease
- BRUE (brief resolved unexplained event)
- Brugsch's syndrome
- Bruton's X-linked agammaglobulinemia
- Bubbly lung syndrome
- Bubonic plague
- Buchanan's disease or osteochondrosis
- Buchem's syndrome (hyperostosis corticalis)
- Budd-Chiari syndrome (hepatic vein thrombosis)
- Budgerigar fancier's disease or lung
- Buerger's disease (thromboangiitis obliterans)
- Bulbus cordis (left ventricle) (persistent)
- Bunionette
- Buphthalmia, buphthalmos (congenital)
- Burdwan fever
- Bürger-Grütz disease or syndrome
- Burke's syndrome
- Burnett's syndrome
- Burn-out (state)
- Buruli ulcer
- Bury's disease
- Bwamba fever
- Byssinosis
- Bywaters' syndrome