A medical dictionary, not AI
The US Medical dictionary is everyday American English plus more than 50,000 medical terms: 165,000 words in all. It was refreshed in October 2026 from official US government sources, and every added word traces back to a published record. JSpell only flags words it cannot find and suggests dictionary spellings; it never rewrites your text.
What it knows
- Drug names: brand and generic names from the FDA's National Drug Code directory and Drugs@FDA, such as semaglutide, Ozempic, apixaban and Keytruda
- Diagnoses: terms from the ICD-10-CM 2027 code set, such as myelofibrosis, preeclampsia and vaping-related disorders
- Medical vocabulary: anatomy, procedures and conditions from the National Library of Medicine's MeSH, such as telemedicine, immunotherapy and laparoscopy
- Common abbreviations such as COPD, MRI, RSV, PTSD and mRNA, and eponyms with their possessives, such as Alzheimer's and Hodgkin's
Who it is for
Nurses, medical and nursing students, medical transcriptionists and scribes, pharmacy staff, and anyone writing letters, notes or coursework with medical terms.
Privacy
Text is checked and then discarded: it is not stored, logged or used to train AI. This free online checker is not a HIPAA service, so do not paste names, dates of birth or other details that identify a patient.
Need medical spell checking inside your own EHR, portal or app, or for patient data? JSpell's server products and SDK run entirely on your own servers with the same medical dictionary. See JSpell software
Medical spell checker FAQ
Is this medical spell checker free?
Yes. It is free, with no account or login. Paste your text, choose US Medical (selected on this page) and click Check Words.
Does it use AI?
No. JSpell checks each word against a dictionary and suggests dictionary spellings. It never writes, rewrites or paraphrases your text.
Does it know new drug names?
Yes. The October 2026 update added current FDA-listed brand and generic names, including recent ones such as semaglutide, tirzepatide, Ozempic and Mounjaro.
Can I paste patient notes?
Not with patient identifiers. The online checker does not store text, but it is not a HIPAA service. For patient data, use JSpell's server products, which run on your own servers.
Where do the medical terms come from?
From official US government sources: the FDA drug directories, the ICD-10-CM 2027 diagnosis codes and the National Library of Medicine's MeSH vocabulary, on top of JSpell's American English dictionary.
Can I add the medical dictionary to my own software?
Yes. The medical dictionary works with the JSpell SDK, JSpell HTML and JSpell Evolution, and with the JSpell spell check API.
How do you spell common medical words like diarrhea, hemorrhage and pneumonia?
In American English: diarrhea, hemorrhage, pneumonia, ophthalmology, esophagus and anesthesia. Common misspellings such as diarhea, hemorage, pnuemonia and opthalmology are flagged, with the correct spelling as the first suggestion.
How do I check the spelling of a medication name?
Paste the text with the drug names and click Check Words. Brand and generic names are recognized, for example Eliquis, lisinopril and acetaminophen, and misspellings such as lisinipril or acetominophen get the correct name as a suggestion.
Is there a spell checker for nurses and nursing students?
Yes. This free medical spell checker knows drug names, diagnoses and clinical vocabulary, needs no account, and uses no AI, so care plans, notes and coursework stay in your own words.
Can I use it for medical transcription?
Yes, for checking spelling in transcribed reports and letters. For transcription that includes patient identifiers, use JSpell's server products on your own servers rather than the free online checker.
Is there a medical spell checker for British, Canadian or Australian English?
The US Medical dictionary uses American spelling (hemorrhage, esophagus). The British, Canadian and Australian English dictionaries include common medical abbreviations such as COPD and MRI and common generic drug names.
Does it help non-native English speakers working in healthcare?
Yes. It shows the correct dictionary spelling of each misspelled word so you can learn it, without rewriting your sentences the way AI writing tools do.