what are you treating the patient for? Per wikipedia here is some examples of what its used for:
A therapeutic pessary is a medical device similar to the outer ring of a diaphragm. Therapeutic pessaries are used to support the uterus, vagina, bladder, or rectum. A pessary is most commonly used to treat prolapse of the uterus. It is also used to treat stress urinary incontinence, a retroverted uterus, cystocele and rectocele. Historically, pessaries may have been used to perform abortions.
The pessary can be placed temporarily or permanently, and must be fitted by a physician, physician assistant, midwife, or advanced practice nurse. Some pessaries can be worn during intercourse.
Here is the conversion website: https://www.aapc.com/ICD-10/codes/index.aspx
I work for an Ob-gyn office and we do Insertion of Pessary's everyday. Most of the time we are doing them due to cystocele, midline or lateral. the DX for that is 618.01, cystocele midline or 618.02 cystocele lateral. hope that helps. These are also ICD-9 codes, not the ICD-10. May I ask why you would be using ICD-10 codes?? but with that being said there is a crosswalk on the AAPC website and the MCR site if you need them. Actually I have a ICD-10 book and the DX for these codes are: lateral-N81.12 and midline-N81.11 and prolapse of uterus, complete, N81.3, w/prolapse of vagina N81.4, hope this helps:)