A healthcare site has a higher proportion of disabled and older visitors than almost any other kind, which makes accessibility failures both more likely to be hit and harder to defend.
Why it matters here specifically. Your visitors are disproportionately the people accessibility rules exist for. A patient who cannot book an appointment online will phone, or will go elsewhere.
Third-party booking embeds are the most common total blocker on clinic sites: custom date pickers that cannot be reached by keyboard, and steps that never announce themselves.
What to do: Complete a real booking using only the keyboard. If it cannot be done, raise it with the vendor and publish a phone alternative clearly.
Clinical sites often use light grey for a calm look. Your audience skews older, and presbyopia is nearly universal past 45.
What to do: Darken body text to at least 4.5:1 and keep it 16px or larger.
An untagged PDF form cannot be completed by a screen reader user at all.
What to do: Offer a web form as well. If the PDF must exist, tag it and label its fields.
Dosage, symptoms and instructions rendered as an image are unreadable to the people most likely to need them.
What to do: Reproduce the content as text below the graphic.
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