Patient presents with complaints of shoulder pain consistent with rotator cuff tendinitis.  The onset of pain was gradual, described as aching and worse with overhead activities and at night.  Patient denies any specific injury or trauma.  Keywords relevant to this presentation include rotator cuff pain, shoulder impingement syndrome, supraspinatus tendinopathy, infraspinatus tendinopathy, and subscapularis tendinopathy.  Physical examination reveals tenderness to palpation over the anterior and lateral aspects of the shoulder, positive Neer and Hawkins impingement signs, and painful arc of motion.  Strength testing demonstrates mild weakness in abduction and external rotation.  Differential diagnosis includes rotator cuff tear, frozen shoulder (adhesive capsulitis), bicipital tendinitis, and cervical radiculopathy.  Diagnostic considerations include shoulder x-ray to rule out bony pathology and assess for degenerative changes.  An MRI may be indicated if a rotator cuff tear is suspected.  Initial treatment plan includes rest, ice, compression, elevation (RICE), nonsteroidal anti-inflammatory drugs (NSAIDs) for pain management, and physical therapy focusing on range of motion and rotator cuff strengthening exercises.  Patient education provided regarding activity modification and proper body mechanics.  Follow-up scheduled in two weeks to assess response to treatment.  ICD-10 code M75.11 (Rotator cuff tendinopathy or tendinitis, right shoulder) or M75.12 (Rotator cuff tendinopathy or tendinitis, left shoulder) is appropriate based on the affected side.  CPT codes for evaluation and management (E/M), physical therapy, and potential injections or imaging will be determined based on services rendered.