Google gets 211 hits for "co-medical staff", and many are documents written by Japanese. I think it's wasei.

@@ -12,1 +12,2 @@
-<gloss>health professionals other than physicians (including nurses, nutritionists, physiotherapists, radiographers, etc.)</gloss>
+<lsource ls_wasei="y">co-medical</lsource>
+<gloss>health professionals other than physicians (incl. nurses, nutritionists, physiotherapists, radiographers, etc.)</gloss>

Google n-gram counts:
コメディカル 33154
コ・メディカル 8317

I don't think "co-medical" is a noun. In fact, I don't believe "co-medical" is an English word. I can't find it in the OED, Webster or Wiktionary. A comment I found on the Web also corroborates this: 英語では，co-medicalという言葉は一般的ではありません．
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The first gloss of my proposed definition is basically a translation of the Kojien definition, and the second gloss is a term used in Australia to refer to these people -- see
http://www.health.nt.gov.au/Allied_Health/
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I think you could add "paramedic" in Webster's first sense: "a person who works in a health field in an auxiliary capacity to a physician (as by giving injections and taking X-rays)" but it could be confused with the 2nd sense, which is certainly more common in Australia at least -- "a specially trained medical technician licensed to provide a wide range of emergency services"
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コ・メディカルに当てはまる職種としては、例えば、管理栄養士、理学療法士、作業療法士、言語聴覚士、臨床検査技師、診療放射線技師、臨床心理士、臨床工学技士、義肢装具士、医療事務などがある。
http://kotobank.jp/word/コ・メディカル
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See also the 該当職種の例 section of the following article:
http://ja.wikipedia.org/wiki/コ・メディカル#.E8.A9.B2.E5.BD.93.E8.81.B7.E7.A8.AE.E3.81.AE.E4.BE.8B

@@ -7,0 +7,3 @@
+<r_ele>
+<reb>コ・メディカル</reb>
+</r_ele>
@@ -9,1 +12,2 @@
-<gloss>co-medical</gloss>
+<gloss>health professionals other than physicians (including nurses, nutritionists, physiotherapists, radiographers, etc.)</gloss>
+<gloss>allied health professionals</gloss>

Entry created