Biceps (bicipital) tendonitis is an inflammation of the long head of the biceps tendon as it passes through the bicipital groove of the anterior humerus
The medial bicipital groove is seen on the surface anatomy of the upper arm. It is formed by the hollow between the biceps and triceps muscles.
It should be distinguished from the bicipital groove or intertubercular sulcus, which is not a surface anatomy structure. It is the groove where the long head of biceps tendon runs between the greater and lesser tubercles below the humeral head before inserting into the superior glenoid rim.
The lateral bicipital groove is seen on the lateral aspect of the upper arm, and is formed by the same anatomical structures as the medial groove.
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Although 20610 & 20605 do not have bundling issues. I would confirm what was injected at the bicipital grove location, I copy an pasted some information from wikipedi and another site I found on a internet search. If this was a tendon injection at this location (20550) it would bundle with 20605
Code 20550 is a column 2 code for 20605 , but a modifier is allowed in order to differentiate between the services provided.
*Use modifier with code 20550
CCI edit Rule:
Misuse of column two code with column one code
AC joint injection has to be reported with 20605 due to it being include in the descriptor,
Arthrocentesis, aspiration and/or injection; intermediate joint or bursa (eg, temporomandibular, acromioclavicular, wrist, elbow or ankle, olecranon bursa)
If this ends up being a tendon injection (20550) at the biciptal grove, I believe the edit would be for the contralateral shoulder to apply the contralateral shoulder so you would reporting only the AC joint injection.