Llanfyllin Medical Practice has been forced to cancel all routine appointments due to extreme weather conditions.
Powys Teaching Health Board announced on Monday morning that the practice is open for urgent appointments only.
A statement from the health board said: "Due to extreme weather conditions and flooding in the local area, please note that Llanfyllin Medical Practice is only open for URGENT appointments and telephone calls today. All routine appointments are cancelled.
"The safety of our patients and staff is paramount."
Dial 999 for medical emergencies or 111 for advice on a range of medical conditions.
Anyone who needs further information can contact the practice on 01691 648054
While at Montgomery Medical Practice, the surgery is only dealing with urgent requests on Monday.
They said on Facebook: "Due to extreme weather conditions, the surgery is only dealing with urgent requests today.
"If you are ringing for urgent medical attention, please ring 01686 669033. For anything else, please ring back tomorrow after 8.30am on 01686 668217.
"To cancel appointments, please call our cancellation line on 01686 669019. This is an answerphone facility."
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